The greatest possible weight of the large bag is 1.9n ounces.
How do you get a mixed number?Divide the numerator by the denominator of an improper fraction to get a mixed number. The mixed number is represented by the answer's whole number, and the fractional portion of the mixed number is represented by the answer's remaining fractional component. No change is made to the denominator.Given:
Weight of 10 apples = n ounces
Weight of 1 apple = n/10 ounces
Weight of n apples = n²/10 ounces
It is given that a large bag of n of these apples weighs less than 40 ounces,
= n²/10 < 40
= n²< 400
= n < 20
So, the large bag contains at most 19 apples.
Hence, the weight of the large bag is at most 1.9n ounces, or (19/10)(n) ounces.
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a standard interior staircase has steps each with a rise (height) of 22 cm and a run (horizontal depth) of 23 cm. research suggests that the stairs would be safer for descent if the run were, instead, 28 cm. for a particular staircase of total height 4.57 m, how much farther into the room would the staircase extend if this change in run were made?
The staircase would extend 104.3cm farther into the room if the run were made 28cm instead of 23cm.
To find out how much farther into the room the staircase would extend if the run were 28 cm instead of 23 cm, we need to calculate the difference in the run and then multiply it by the number of steps.
The difference in the run is 28cm - 23cm = 5cm
To find the number of steps, we need to divide the total height of the staircase by the height of each step:
4.57m / 0.22m = 20.86 steps.
So the difference in the run multiplied by the number of steps is:
5cm * 20.86 steps = 104.3cm.
Therefore, the staircase would extend 104.3cm farther into the room if the run were made 28cm instead of 23cm.
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For the matrix A below, find a nonzero vector in Nul A, a nonzero vector in Col A, and a nonzero vector in Row A = 1350 012-7 A nonzero column vector in Nul Ais A nonzero column vector in Col A is A nonzero column vector in Row Ais
As per row echelon form of the matrix, the column space for the given matrix A is { [1 0], [3 1] }
The term row echelon form of the matrix is defined as a matrix is in echelon form if it has the shape resulting from a Gaussian elimination.
Here we have given the following matrix
[tex]\begin{bmatrix}1 &3 &5 &0 \\0 & 1 & 2 & -3\end{bmatrix}[/tex]
As we all know that the column space is a space spanned by the columns of the initial matrix that correspond to the pivot columns of the reduced matrix.
As per the definition of row echelon the given matrix is already in the row echelon form.
So, the column space is written as, first two columns
=> [tex]\begin{bmatrix}1 \\0\end{bmatrix}\begin{bmatrix}3 \\1\end{bmatrix}\\[/tex]
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In a Biology Laboratory at the beginning of an experiment there are 100 bacteria. During the experiment it is expected that the number of bacteria will double itself every 2 hours. Under this condition how long will it take the number of bacteria to reach 3200?
The amount of time that it will take for the bacteria to reach 3,200 is given as follows:
5 hours.
How to define an exponential function?An exponential function is defined as follows:
y = ab^x.
For which the parameters are given as follows:
a is the initial value.b is the rate of change.For this problem, there are initially 100 bacteria, doubling each hour, hence the parameter values are given as follows:
a = 100, b = 2.
Hence the function is defined as follows:
y = 100(2)^x.
The amount will reach 3200 for x when y = 3200, hence:
3200 = 100(2)^x.
2^x = 3200/100
2^x = 32
2^x = 2^5
x = 5.
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22. find m/ABD (7q-46) (3q+6)°
So on solving provided question we can say that given angle is m/ABD (7q-46) (3q+6)° = m/ABD = 98
what are angles?An angle is a form in Euclidean geometry made composed of two rays, called the angle's sides, that meet at a point in the middle known as the angle's vertex. In the plane where the rays are placed, two rays can produce an angle. An angle is also produced when two planes intersect. They're known as dihedral angles. In plane geometry, an angle is the form that two rays or lines with a common termination might take. The Latin word "angulus," which means "horn," is where the English word "angle" comes from. The two rays, also known as the sides of the angle, have a common termination known as the vertex.
here,
the given angle is m/ABD (7q-46) (3q+6)°
m/ABD = 98
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Sydney invests $100 every month into an account that pays 0.8% annual interest, compounded monthly. Benny invests $80 every month into an account that pays 2.2%
annual interest rate, compounded monthly.
a. Determine the amount in Sydney's account after 10 years.
b. Determine the amount in Benny's account after 10 years.
c. Who had more money in the account after 10 years? Sydney
d. Determine the amount in Sydney's account after 30 years. $40,672.12
e. Determine the amount in Benny's account after 30 years.
f. Who had more money in the account after 30 years? Benny
Answer:
a. $20,442.09
b. $47,981.82
c. Benny
d. $211,063.58
e. $9,583,450.63
f. Benny
a probabilistic skip list is generated using a fixed probability of 1/2. if nis the number of items in the skip list, what is the average number of layers in the skip list?
If a probabilistic skip list is generated by a fixed probability of 1/2 and n is number of items in skip list then average number of layers in skip list is [tex]log2(n)[/tex] .
let the size of the list be = n ;
So , the first iteration the length of list is = n ;
the list reduces to 1/2 , because the list is using fixed probability of 1/2 ;
So , the second iteration : the length of list is = n/2 ;
similarly , the length of list is = [tex]\frac{n}{2^{2} }[/tex] ;
following the pattern ,
we can say that after "k" iteration , the size of the list is 1 .
where "k" represents number of layers ;
So , [tex]\frac{n}{2^{k} } =1[/tex] ;
simplifying further ,
we get ;
⇒ [tex]N = 2^{k}[/tex] ;
⇒ [tex]k=log2(n)[/tex] .
Therefore , The average number of layers in skip list is [tex]log2(n)[/tex] .
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The volume of a cylinder is 90 cm3. If the radius is 3 cm, what is the height of the cylinder?
(A) 15 cm
(B) 5cm
(C) 30 cm
(D) 10 cm
Answer:
10 cm
Step-by-step explanation:
Data :
Volume = V = 90π cm³
Radius = r = 3cm
Area = A = π(3)²
Formula for volume is
V = πr² h
Solve for height h
h = V/(πr²)
h = 90π / π3² = 90π /9π
h = 10 cmData :
Volume = V = 90π cm³
Radius = r = 3cm
Area = A = π(3)²
Formula for volume is
V = πr² h
Solve for height h
h = V/(πr²)
h = 90π / π3² = 90π /9π
h = 10 cmData :
Volume = V = 90π cm³
Radius = r = 3cm
Area = A = π(3)²
Formula for volume is
V = πr² h
Solve for height h
h = V/(πr²)
h = 90π / π3² = 90π /9π
h = 10 cmv
______ units of measure.
Meter, kilogram and time units of measure.
What is Metric System?Everything around us has a measurement value, from the amount of sugar you put in a cake to the size of a football field. Each thing is measured differently based on its length, weight, volume, or duration. With these measurements, the idea of "Metric System" is introduced.
The Metric system has 3 main units namely, meter to measure the length, kilogram to measure the mass, and seconds to measure time.
Therefore, meter, kilogram and time units of measure.
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5.jill is 9 kilometers away from joe. both begin to walk toward each other at the
same time. jill walks at 1.5 kilometers per hour. they meet in 2 hours. how fast is
joe walking?
Joe moves along at a speed of 2.5 km/h.
What is speed?Speed is what it means. the speed at which an object's location changes in any direction.
The distance traveled in relation to the time it took to travel that distance is how speed is defined.
Since speed simply has a direction and no magnitude, it is a scalar quantity.
So, calculate walking speed of Joe as follows:
Jill covers 9 kilometers in 3 hours while moving at a 3-kilometer-per-hour pace.
Joe covers 7.5 kilometers in 3 hours while walking at a speed of x miles per hour.
Applying the formula, D = R * T.
We can determine Joe's rate by replacing D, which is 7.5 kilometers, and T, which is 3 hours:
7.5 = R * 3
Both sides by 3: Divide
R = 2.5
Therefore, Joe moves along at a speed of 2.5 km/h.
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Correct question:
Jill is 16.5 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill is 16.5 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill is walking 3 kilometers per hour. They meet in 3 hours. How fast is Joe walking?
suppose a veterinarian applies the procedure to a flock of 100,000 chickens at a commercial egg production farm. the elisa test is known to have probability 0.05 of producing a false positive result and probability 0.10 of producing a false negative result for a single chicken. a. if no chicken in the flock is infected with the h6n2 virus, what is the probability that the veterinarian will conclude that the h6n2 virus is not present in the flock? show how you found your answer. b. if no chicken in the flock is infected with the h6n2 virus, what is the probability that the veterinarian will conclude that the h6n2 virus is present in the flock? show how you found your answer. c. if every chicken in the flock is infected with the h6n2 virus, what is the probability that the veterinarian will conclude that the h6n2 virus is present in the flock? show how you found your answer. d. if 20 percent of the chickens in the flock are infected with the h6n2 virus and the other 80 percent are not infected, what is the probability that the veterinarian will conclude that the h6n2 virus is present
The respective probabilities are -
(a).P(vet concludes-no virus ,if no chicken is infected)=0.988,
(b).P(vet cincludes virus,if no chicken is infected)= 0.012,
(c).P(vet cincludes virus, if every chicken is infected)=0.99 ,
(d).P(vet cincludes virus, if 20% chickens are infected)= 0.383.
This problem involves the probability of binomial distribution as there are only two outcomes of the event, either the bird is infected or its not infected.
Now, let us suppose in this problem, that x is a random variable indicating the no. of chickens infected.
According to question , P(false positive test)=0.05,
P(false negative test)=0.10 where false positive test means that the bird is not infected and still the vet says that its infected.
false negative test means that the bird is not infected and the vet declares it to be infected.
Now, P(bird is not infected) = 1- P(bird tested false positive) = 1-0.05=0.95
Similarly, P(bird is infected) = 1 - P(bird tested false negative) 1- 0.10=0.90
Now, in the question , the vet declares the flock as infected if at least 3 out of 10 chickens are infected.
So, in (a) , t]if the vet does not declare the birds as infected means less than 3 birds would only be infected.
so, P(vet declares as uninfected) = P(x=0) + P(x=1) + P(x=2)=
10C0 (0.05)^0 (0.95^10) + 10C1 (0.05)^1 (0.95)^9 + 10C2(0.05)^2 (0.95)^8
Upon calculating this , we get 0.988.
Now, for (b) , P(no virus and vet declares it to be present)= 1- P(no virus and vet does not declare it to be infected)= 1-0.988 = 0.012.
(c) - the probability that every chicken in the flock is infected with the h6n2 virus, what is the probability that the veterinarian will conclude that the h6n2 virus is present in the flock = 1- P(every chicken is infected and the vet declares as not infected) = 1- bin (10,0.9,2)
=1- 10C0(0.9)^0(0.1)^10 + 10C1(0.9)^1(0.1)^9 + 10C2(0.9)^8(0.1)^2 = 1- 0.001 = 0.99.
(d) . Now here, we need to calculate P(x>=3) =
1- [10C0(0.22)^0(0.78)^10 + 10C1(0.22)^1(0.78)^9 + 10C2(0.22)^8(0.78)^2]
=0.383.
So, in this way we get answers as (a)-0.988 , (b)- 0.012, (c)-0.99 , (d) - 0.383.
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When solving a system of linear equations, try to algebraically form one equation that has only one variable. T/F
False. Solving a system of linear equations requires solving for multiple variables.
To solve for a single variable, you would only need to solve one equation.
To solve a system of linear equations, you need to use methods such as elimination, substitution, or graphing. For example, consider the system of equations:
3x + y = 7
2x - y = 4
To solve this system, you could use elimination by adding the equations together. This would give you the equation 5x = 11. To solve for x, you would then divide both sides by 5, giving you x = 11/5.
Once you have solved for x, you can substitute this value into either of the original equations to solve for y. In this example, substituting 11/5 for x into the first equation would give you 3(11/5) + y = 7. Simplifying this equation gives you y = -2/5.
Therefore, the solution to this system of linear equations is x = 11/5 and y = -2/5.
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ap stats let the random variable b represent the number in the sample who have a bachelor's degree. what is the probability that b will equal 40
The probability that B will equal 40, where random variable B represent the number in the sample who have a bachelor’s degree is 1.1340323e-12, that is 1.1340323 × 10⁻¹².
The question is asking for the probability that B, the number of residents in the sample of 50 who have a bachelor's degree, will equal 40. To calculate this probability, we need to use the binomial probability formula, which is:
P(B = x) = (n choose x) × pˣ × (1-p)⁽ⁿ⁻ˣ⁾
where:
n = sample size (50)
p = probability of success (31%)
x = number of successes (40)
So, the probability that B will equal 40 is:
P(B = 40) = (50 choose 40) × (0.31)⁴⁰ × (0.69)⁽⁵⁰ ⁻ ⁴⁰⁾
P(B = 40) = 1.1340323e-12
This is a very small probability, which means that it is very unlikely that exactly 40 of the 50 residents in the sample will have a bachelor's degree.
--The question is incomplete, answering to the question below--
"According to a recent survey, 31 percent of the residents of a certain state who are age 25 years or older have a bachelor’s degree. A random sample of 50 residents of the state, age 25 years or older, will be selected. Let the random variable B represent the number in the sample who have a bachelor’s degree. What is the probability that B will equal 40 ?"
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Factorise 6-y^2
Please help
Answer:
6-y^2 can be factored by using the difference of squares formula which states that:
a^2 - b^2 = (a+b)(a-b)
We can factorize 6-y^2 by using the following:
6 - y^2 = (sqrt(6) + sqrt(-y^2))(sqrt(6) - sqrt(-y^2))
= (sqrt(6) + yi)(sqrt(6) - yi)
where i is the imaginary unit.
So, 6-y^2 = (sqrt(6) + yi)(sqrt(6) - yi) is the factored form of 6-y^2
Please note that the factorization is only true for real values of y, when y is not real the expression can't be factorized.
Indicate if each equation in the table has no solutions, one solution, or
infinitely many solutions.
- 2(x - 2) = 4 - 2x
A
B
C
A. No Solution
B. One Solution
C.
Infinitely many
solutions
The linear equation -2(x - 2) = 4 - 2x has infinitely many solutions
What is a Linear EquationA linear equation is a mathematical statement that describes a relationship between two or more variables and is written in the form of ax + by = c, where a, b and c are constants and x and y are variables. The equation is called "linear" because it is a first degree equation and it describes a straight line when graphed on a coordinate plane.
In this problem, we have to solve for the value of x
-2(x - 2) = 4 - 2x
Open the bracket
-2x + 4 = 4 - 2x
collect like terms
-2x + 2x = 4 - 4
0 = 0
This has an infinitely many solution
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The population of a city increases by 1.6% per year. If this year's population is 237,000, what will next year's population be, to the nearest individual?
The population next year is 240792
How to determine the population next yearFrom the question, we have the following parameters that can be used in our computation:
Initial population = 237,000
Rate = 1.6% per year
The population next year can be calculated as
Population = Initial * (1 + Rate)
Substitute the known values in the above equation, so, we have the following representation
Population = 237000 * (1 + 1.6%)
Evaluate
Population = 240792
Hence, the new population is 240792
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find the diameter of each circle. use 3.14 for the value of pi. round your answer to the nearest tenth. circumference = 69.1 yd
please hurry
The diameter of a circle with a circumference of 69.1 yds is 22.
What is circumference of a circle?
The measurement of the circle's perimeter, also known as the circle's boundary, is called its circumference . The radius of the circle is considered when applying the formula to determine the circumference of the circle.
Circumference of circle(C) = 2πR
where,
R represents the radius of the circle
We know that diameter of circle is twice of its radius i.e
Diameter(D) = 2R
Thus, C = πD
We are given Circumference(C) = 69.1yd and π= 3.14
So, using C = πD, we get
⇒69.1 = 3.14*D
⇒D = 69.1/3.14
⇒D = 22
Hence, the diameter of a circle with a circumference of 69.1 yds is 22.
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Jamie's brother Nick is 10 years older than jaime is. Two years ago, Nick was three times older than Jaime was. In how many years will Nick be twice Jaimes age?
The number of years Nick will be twice as Jaime's age is 3 years time.
How to find the number of years Nick will be twice the age of Jamie?Jamie's brother Nick is 10 years older than Jaime is. Two years ago, Nick was three times older than Jaime was.
The number of years Nick will be twice as Jamie's age can be calculated as follows:
let
Jamie age = x
Nick age = x + 10
Two years ago:
3(x - 2) = x + 10 - 2
3(x - 2) = x + 8
3x - 6 = x + 8
3x - x = 8 + 6
2x = 14
x = 14 / 2
x = 7
Nick age = 7 + 10 = 17
Let's find the number of years Nick years will be twice as Jamie's age.
Let
y = number of years
2(7 + y) = 17 + y
14 + 2y = 17 + y
2y - y = 17 - 14
y = 3
y = 3
Hence, in 3 years time Nick age will be twice of Jaime's age.
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A ball is launched from a 114.24-foot tall platform. The equation for
the ball's height hat time t seconds after launch is h (t)=-16f² +
59.2t+114.24, where his in feet. What is the maximum height the
ball achieves before landing?
To find the maximum height the ball achieves before landing, we need to find the vertex of the parabola represented by the equation h(t) = -16t^2 + 59.2t + 114.24. The vertex form of a parabola's equation is y = a(x-h)² + k where (h, k) is the coordinates of the vertex.
We can get the vertex form by completing the square of x term.
h(t) = -16t² + 59.2t + 114.24
h(t) = -16(t² - 3.68t) + 114.24 + 3.68t
h(t) = -16(t-0.92)² + 118.92
The maximum height is 118.92 ft which is k.
Uday Tahlan
The system of equations below has no solution.
StartLayout enlarged left-brace 1st row two-thirds x + five-halves y = 15 2nd row 4 x + 15 y = 12
An equation that could represent a linear combination of the given system of equations is: B. 0 = -78.
What is no solution?In Mathematics, no solution is also referred to as zero solution, and an equation is said to have no solution when the left hand side and right hand side of the equation are not the same or equal.
Generally speaking, a linear combination of any system of equations can be obtained by either adding or subtracting a multiple of the equations of the system.
2x/3 + 5y/2 = 15 ......equation 1.
4x + 15y = 12 ......equation 2.
By multiplying equation 1 with 6 and equation with 1, we have the following system of equations:
4x + 15y = 90 ......equation 3.
4x + 15y = 12 ......equation 4.
By subtracting equation 3 from equation 4, we have the following:
0 = -78
In this context, we can reasonably infer and logically conclude that 0 = -78 is an equation that would most likely represent a linear combination of the given system of equations.
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Complete Question:
The system of equations below has no solution.
2x/3 + 5y/2 = 15
4x + 15y = 12
Which equation could represent a linear combination of the system?
A) 4/3x=42
B) 0= -78
C)15/2y=33
D)0=0
Which of the following is NOT a solution to the system of inequalities?
(1,2)
(0,4)
(2,1)
(1,5)
Answer:
(2, 1 ) is not a solution to the system
Step-by-step explanation:
the solution lies in the shaded region between the 2 lines.
(1, 2 ) lies within this region and is a solution
(0, 4 ) lies within this region and is a solution
(2, 1 ) does not lie inside the region and is therefore not a solution
(1, 5 ) lies within this region and is a solution
Thus
(2, 1 ) is the only point that is not a solution to the system
we roll a fair 6-sided die 5 times. what is the probability that exactly 3 of the 5 rolls are either a 1 or a 2?
Therefore , the solution of the given problem of probability comes out to be the result of adding these five times is: 5 x (1/32) = 5/32.
What does probability mean as a process?Probability theory is a branch of mathematics that deals with estimating the likelihood of an event occurring or of a claim being true. A probability is just a value between 0 and 1 and 1, with 0 approximately denoting the possibility of an event occurring and 1 denoting certainty. The likelihood or chance that an event will occur is expression numerically as a probability.
Here,
There are five options since you need one additional set and four even numbers:
5 C 4 ==5
OEEEE, EOEEE, EOEOE, EEEOE, and EEEEO
Three-sixths of the time, you'll obtain an odd number.
Three-sixths of the time, you'll obtain an even number.
As a result, the likelihood of OEEEE is (3/6)5=1/32.
This also represents the likelihood of each additional possibility.
The result of adding these five times is: 5 x (1/32) = 5/32.
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pls help due tomorrow!!!!
Answer:
Any real value.
Step-by-step explanation:
Ok, so I am just gonna simplify the question a little bit.
[tex]\frac{x-8+3}{5}[/tex] = (x - 5)/5 or x/5 - 1..
Wait a minute, the question doesn't make sense.
The question is true for any value of x as | x | > 0 and - | x | will be < 0 no matter what.
Alden has two part-time jobs. He works 4 times as many hours at a grocery store than he works at a shoe store. Let g represent the hours Alden works at the grocery store and s represent the time he works at the shoe store.
Which equation represents the relationship between the hours that Alden works at the grocery store and the shoe store?
Answer:
4g=s
Step-by-step explanation:
4g=s
there are 4 g's for every s as he work for 4 times as many hours at the grocery store.
rodney uses the following clues to try to guess a secret number: it is a two-digit integer. the tens digit is odd. the units digit is even. the number is greater than $65$. if rodney guesses a number that has each of these properties, what is the probability that rodney will guess the correct number? express your answer as a common fraction.
probability will be 1/2 for obtaining correct number that is ng clues to try to guess a secret number: it is a two-digit integer. the tens digit is odd. the units digit is even. the number is greater than $65$.
How do you calculate probability
Probability is the likelihood that something will happen. Probability is calculated by dividing the number of ways the event can occur by the total number of outcomes
it is a two-digit integer. the tens digit is odd. the units digit is even. the number is greater than $65$.
the numbers are 67,69,83,.....etc
In order to simplify these types of expressions, first of all the external element is distributed into the bracket.
This property is called distributive property where the outer number is distributed into the bracket.
The distributive property is generally stated as:
So applying the property on given expression
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What is the equation of a circle with a center (8, 4) and radius of 7?
The equation of a circle with a center (8, 4) and radius of 7
(x - 8)² + (y - 4)² = 49How to determine the equation the circleInformation given in the question
the equation of a circle with a center (8, 4) and radius of 7
Equation of a circle is given as
(x - h)² + (y - k)² = r²
The equation of the circle is written by substituting for h and k and r where
h = 8
k = 4
r = 7
substituting the values of h k and r into the equation results to
(x - 8)² + (y - 4)² = 7²
(x - 8)² + (y - 4)² = 49
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In a triangle, the measure of the first angle is six times a number. The measure of the second angle is nine less than the first angle. The measure of the third angle is three times the number more than the measure of the first angle. Which equation best represents this description of the triangle
The equation 10x + 9 = 180 can be used to represent the description of the triangle, and solving for x gives x = 17.1.
x + 6x + 3x + 9 = 180
10x + 9 = 180
10x = 171
x = 17.1
The measure of the first angle is represented by x, and the measure of the second angle is represented by 6x - 9. The measure of the third angle is represented by 3x + 9. We can add these three equations together to get the equation 10x + 9 = 180. We can then solve for x by subtracting 9 from both sides of the equation to get 10x = 171. Finally, we can divide both sides of the equation by 10 to get x = 17.1.
The equation 10x + 9 = 180 can be used to represent the description of the triangle, and solving for x gives x = 17.1.
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Solve 11/5 x-2/3 = 1 13/45
Answer:13/9
Step-by-step explanation:11x/5 -2/3 = 113/45 after adding 2/3 to both sides we have 11x/5 = 143/45. Now we multiply 11x/5 by 9/9 which equals 99x/45 = 143/45. This means 99x = 143 and x =143/99 = 13/9
Find the first three terms of the sequence below. T n = n 2 − 2 n − 4
The first three terms of the sequence is -5,-4,-1.
What is sequence of the number?
The fundamental concepts in mathematics are series and sequence. A series is the total of all elements, but a sequence is an ordered group of elements in which repetitions of any kind are permitted. One of the typical examples of a series or a sequence is a mathematical progression.
Here the given sequence nth term formula is,
=> [tex]T_n=n^2-2n-4[/tex]
Now put n=1 into given formula then
=>[tex]T_1=1^2-2*1-4=1-2-4 =-5[/tex]
Now put n=2 into given formula then
=> [tex]T_2=2^2-2*2-4=4-4-4=-4[/tex]
Now put n=3 into given formula then
=> [tex]T_3=3^2-2*3-4=9-6-4=-1[/tex]
Hence the first three term of the sequence i -5,-4,-1.
To learn more about sequence refer the below link
https://brainly.com/question/7882626
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I need the system of equations.
Answer:no
Step-by-step explanation:
share 27 in the ratio 7:2
Answer: 21:6
Step-by-step explanation: Use the ADAM method to help you with ratio problems like these (Add Divide And Multiply)
Add the numbers in the given ratio: 7+2=9
Divide the amount given by this number: 27/9=3
And (just there for the acronym)
Multiply this number by the numbers in the ratio: 7 x 3 = 21 2 x 3 = 6
final answer= 21:6
