The function gives the mass, m, of a radioactive substance remaining after h half-lives. Cobalt-60 has a half-life of about 5.3 years. Which equation gives the mass of a 50 mg Cobalt-60 sample remaining after 10 years, and approximately how many milligrams remain?
The equation is [tex]f(t)=50(0.5)^{\frac {10}{5.3}}[/tex] and approximately 13.52 milligram remains
How to determine the equation?The missing information in the question is:
[tex]f(t)=m(0.5)^{\frac th}[/tex]
When the mass is 50 mg, it means that:
m = 50
So, we have:
[tex]f(t)=50(0.5)^{\frac th}[/tex]
When 10 years remain in the life of the substance, it means that:
t = 10
So, we have:
[tex]f(t)=50(0.5)^{\frac {10}h}[/tex]
The half life is 5.3. So, we have
[tex]f(t)=50(0.5)^{\frac {10}{5.3}}[/tex]
Evaluate the equation
f(t) = 13.52
Hence, the required equation is [tex]f(t)=50(0.5)^{\frac {10}{5.3}}[/tex] and approximately 13.52 milligram remains
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Answer:c
Step-by-step explanation:
Please help answer this question asap 2/11
The correct answer is option A which is the value a₃₂ = 7.
What is the matrix?A matrix is a specific arrangement of items, particularly numbers. A matrix is a row-and-column mathematical structure. The a_{ij} element in a matrix, such as M, refers to the i-th row and j-th column element.
In the given matrix the value of a₃₂ means that the element of the third row and the second column.
So the value of a₃₂ will be 7. which is present in the third row and the second column.
Therefore the correct answer is option A which is the value a₃₂ = 7.
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Two open cylinders have the same radius but one is twice as long as the other.
a) Calculate the volume of the two cylinders and compare them using a final statement (sentence).
b) Calculate the surface area of the two cylinders and compare them using a final statement (sentence). If you notice a relationship between volume and surface area,add it to your final
statement. (God bless anyone who can help me ).
Answer:
shown below
Step-by-step explanation:
a) V = h(pi)r²
let x = height
and c = the constant radius
V1 = 2x(pi)c²
V2 = x(pi)c²
let c = random number, such as 2
let x = 3
2x(pi)4
x(pi)4
pi(4) = 12.57
3 x 12.57 = 37.7
6 x 12.57 = 75.4
We can compare these ans realise that the cylinder with double the height will also have double the volume.
b) SA = h(pi)2c
SA1 = 2x(pi)2c
SA2 = x(pi)2c
let c = 2
let x = 3
2(3)(pi)(2(2))
6(pi)4
24(pi)
3(pi)(2)(2)
3(pi)(4)
12(pi)
I don't need to finish the calulation to see that this is also halved. So the surface area of the one with the double length is twice the surface area of the one with a smaller height.
Comparatively, both the volume and surface area are doubled when the height is doubled.
QED.
Sarah transfer 450 from her saving account to her checking account she uses the check register to record her transaction but will her new balance.
After transferring $450 from the savings account to the checking account, the updated balance in :
the savings account is =previous balance-$450the checking account= previous balance +$450Calculation of the new balance?All of that is based on the notion that Sarah's savings and checking accounts are distinct from one another.
Assume that, Sarah's savings account balance was 'x' and checking account balance was 'y'.
She transferred $450 from the savings to the checking account.
∴Updated savings account balance= x-450 units
∴Updated checking account balance= y+ 450 units.
Therefore, it can be concluded that the current value of Sarah's savings account would be the amount >$450, and the updated value of her checking account would be the balance <$450 if she transferred $450 from her savings account to her checking account.
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HEEEEEEEELLLLLLLPPPPPPPPPPPPPPPPPPPPPPPPPPPPPp
Answer:
6
Step-by-step explanation:
This problem centers on recognizing the relationship between fractions and repeating decimals.
Note the following:
[tex]\frac{1}{3}=0.33333333333333333333333333333333333333333333333...[/tex]
or more simply [tex]\frac{1}{3}=0.\bar{3}[/tex]
This means that [tex]2\frac{1}{3}=2.\bar{3}[/tex]
Going back to the original expression, [tex]3\frac{2}{3}+2.\bar{3}[/tex] simplifies to [tex]3\frac{2}{3}+2\frac{1}{3}[/tex]
Next, adding mixed numbers. For adding mixed numbers, whole number parts and fractional parts can be added separately (this is because of the associative and commutative properties of addition)... because
[tex]3\frac{2}{3}+2\frac{1}{3}[/tex] means the same thing as
[tex](3+\frac{2}{3})+(2+\frac{1}{3})[/tex]
Changing the order, we can write it as
[tex]3+2+\frac{2}{3}+\frac{1}{3}[/tex]
Adding the whole number parts, 3+2 is 5.
Next, adding the fraction parts:
For adding fractions, one must have a common denominator (the bottom part of the fraction must be the same). Once they are the same, the denominator just sort of "hangs out" until the end without changing, and the numerators (the tops) are added together.
Fortunately, the denominators are already the same. So, add the numerators, and the denominator will stay as a 3.
[tex]\frac{2}{3}+\frac{1}{3}[/tex]
[tex]\frac{1+2}{3}[/tex]
[tex]\frac{3}{3}[/tex]
It is important to recognize that any fraction* where the number on the top matches the number on the bottom, the fraction is equivalent to 1.
*(except if the number we're talking about is zero)
So, the fraction parts added together, are equivalent to 1, and the whole number parts added were equal to 5. Returning to our expression...
[tex]3+2+\frac{2}{3}+\frac{1}{3}[/tex]
[tex]5+\frac{3}{3}[/tex]
[tex]5+1[/tex]
[tex]6[/tex]
Please help me answer question 7/11 asap
The value of a₃₃ is 1.
What is Matrices?Matrices is a plural form of a matrix, which is a rectangular array or a table where numbers or elements are arranged in rows and columns.
Here, aₓₙ is the element of matrix in which x represents the number of row and n represents the number of column of element.
So, a₄₃ means element from 4th row and 3rd column.
3rd row = [6 7 1 8]
3rd column = [tex]\left[\begin{array}{ccc}8\\6\\1\\3\end{array}\right][/tex]
the common value between them is 1.
Thus, the value of a₃₃ is 1.
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What is the nth term rule of the linear
sequence
below?
1, 7, 13, 19, 25, . ..
Answer:
Un= 1+(n-1)6
Step-by-step explanation:
a = 1
d= 7-1= 13-7= 6
and using the formula, Un= a+(n-1)d
Which parent function is represented by the graph?
Answer:
Linear
Step-by-step explanation:
pretty self explanatory
Answer:
The linear parent function Step-by-step
Step-by-step explanation:
Linear functions are always characterized by a straight line graph with or without an intercept on the vertical or horizontal axis. A linear function usually has an independent variable and a dependent variable.
Hope your having a great day!!
how can pascal's triangle be useful in finding probabilities? 30 point for thisss I need help
Answer: The coefficients of binomial expansions are calculated using Pascal's triangle.
Find x and y.
help please ty:)
Please, make sure you understand the solution:
We can notice that x + (x - 28) = 90
2x - 28 = 90
2x = 118
x = 59
Now for y:
We can notice that y + 90 + x = 180
y + 90 + 59 = 180
y + 149 = 180
y = 180 - 149
y = 31
Select the two binomials that are factors of 49x^2 - 36
A. 7x + 12
B. 7x - 3
C. 7x + 6
D. 7x - 6
By definition of the subtraction of squares, the binomial 49 · x² - 36 have the following two factors: 7 · x + 6, 7 · x - 6 (Correct choices: C, D)
How to find the factors of subtraction of squares
A subtraction of squares is a binomial which satisfies the following property:
a² - b² = (a - b) · (a + b) (1)
If we know that a² = 49 · x² and b² = 36, then we have the following factors:
49 · x² - 36 = (7 · x - 6) · (7 · x + 6)
By definition of the subtraction of squares, the binomial 49 · x² - 36 have the following two factors: 7 · x + 6, 7 · x - 6 (Correct choices: C, D)
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What is the quotient startfraction negative 8 a superscript 8 baseline b superscript negative 2 baseline over 10 a superscript negative 4 baseline b superscript negative 10 baseline endfraction in simplified form? assume a not-equals 0, b not-equals 0.
The quotient for the given exponential expression (-8a⁸b⁻²)/(10a⁻⁴b⁻¹⁰) is (-4/5)(a¹²b⁸).
Exponents are of the form aˣ, read as "a to the power of x", and signify the product of a multiplied by itself x number of times.
In the question, we are given an exponential expression (-8a⁸b⁻²)/(10a⁻⁴b⁻¹⁰) and are asked to find the quotient of it.
To find the quotient, we will try to simplify the equation using the laws of exponents in the following way:-
(-8a⁸b⁻²)/(10a⁻⁴b⁻¹⁰),
= (-4/5)(a⁽⁸ ⁻ ⁽⁻⁴⁾⁾b⁽⁻² ⁻ ⁽⁻¹⁰⁾⁾) {Using the law of exponent: [tex]\frac{x^{a} }{x^{b} } =x^{(a-b)}[/tex] }
= (-4/5)(a¹²b⁸).
Therefore, the quotient for the given exponential expression (-8a⁸b⁻²)/(10a⁻⁴b⁻¹⁰) is (-4/5)(a¹²b⁸).
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Which of the following is a factor of x^3-7x-6?
A. X+3
B. X+4
C. X-2
D. X+1
there are 7 yellow marbles and 10 orange marbles in a bag you randomly choose one of the marbles what is the possibilty of choosing a yellow marble
Answer:
probability; ( of choosing a yellow marble)
7 yellow marbles + 10 orange marbles = 17 in total
if the no of yellow marbles is 7 therefore = ⁷/10
so that is the probability ⁷/10
Hope this helps
PLEASE HELP ASAP!! Kate is trying to convert an area from meters squared to centimeters squared. She multiplied the area she had by 100 and got the wrong answer. What should she have multiplied the original area by?
1,000
1,000,000
100
10,000
Answer:
1m=100cm
1m squared=100cm×100cm
1msquared= 10000cm squared
She has to multiply 10000 to convert square centimetres to square meters. Hence option D is correct.
What is unit conversion?Multiplication or division by a numerical factor, selection of the correct number of significant figures, and unit conversion are all steps in a multi-step procedure.
We know that 1 meter is equal to 100 cm now for a 1-meter square the centimetres will be calculated as,
1m=100cm
1m squared=100cm×100cm
1msquared= 10000cm squared
Hence option D is correct.
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bear corp. has $100,000 cash in the bank restricted to repay a note payable that matures in 2 years. how should this $100,000 be reported?
It should be reported as a restricted cash in the long-term section of the company balance sheet.
What is note payable?Note payable can be defined a the money a company or an organization owes or the money they are expected to payback..
Note payable is classified as long term liabilities. Hence, the cash amount of $100,000 should be reported or recorded in the balance sheet as a restricted cash.
Therefore the $100,000 is reported as a restricted cash.
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Solve for x :
[tex]\qquad \rightarrow\bf 4x + 9x + 2x = 30[/tex]
I Need explanation
Answer:
x=2
Step-by-step explanation:
combine like terms to get 15x=30. divide by 15 on both sides to get x=2
Answer:
x=2
Step-by-step explanation:
1. Simplify the expression
4x+9x+2x=30
Simplify the arithmetic:
15x=30
2. Isolate the x
15x=30
Divide both sides by 15:
[tex]\frac{15x}{15}=\frac{30}{15}[/tex]
Simplify the fraction:
[tex]x=\frac{30}{15}[/tex]
Find the greatest common factor of the numerator and denominator:
[tex]x=\frac{2\cdot 15}{1\cdot 15}[/tex]
Factor out and cancel the greatest common factor:
[tex]x=2[/tex]
Why learn this
Linear equations cannot tell you the future, but they can give you a good idea of what to expect so you can plan ahead. How long will it take you to fill your swimming pool? How much money will you earn during summer break? What are the quantities you need for your favorite recipe to make enough for all your friends?
Linear equations explain some of the relationships between what we know and what we want to know and can help us solve a wide range of problems we might encounter in our everyday lives.
Terms and topics
Linear equations with one unknownThe table to the right lists probabilities for the corresponding numbers of girls in three births. What is the random variable, what are its possible values, and are its values numerical?
The true statement is (b) the random variable is x, the possible values are 0 to 3 and the values are numerical
How to determine the true statement?The table is added as an attachment
From the attached image, we have:
Number of girls (x) P(x)
0 0.125
1 0.375
2 0.375
3 0.125
In the above, the random variable is x, while P(x) represents its probabilities.
Also, the possible values are 0 to 3 as shown in the table.
0 to 3 are numerical digits, and the values are numerical
Hence, the true statement is (b)
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HELP I REALLY NEED HELP
Answer: 72 inches squared
Step-by-step explanation:
So, the real floor of a classroom is 36 feet by 32 feet.
And the scale drawing, has length of the classroom equal to 9 inches.
What is the area in square inches of the floor in the scale drawing
1 foot = 12 inches
The length of the classroom, measured in feet, has been multiplied by 12, to get converted in inches. After that, it has been divided by a number, a proportion, to get to 9 inches.
36feet * 12 / x = 9 inches
432 inches / x = 9 inches
Now, to solve for x, we can cross-multiply
432 inches = 9x inches
Divide 9 inches on both sides.
x = 48
To solve the exercise, we need to calculate the floor's area in the scale drawing.
We have the length = 9 inches.
Now, let's calculate the width
Width = 32 feet * 12 / 48
Width = 384 inches / 48
Width = 8 inches
Area = Length * Width
Area = 9 inches * 8 inches
Area = 72 inches squared
Hope I helped!
Which list is in order from least to greatest?
Answer:
The first option.
Explanation:
Since these numbers are given in scientific notation, we must first look at the exponent to determine whether or not it's big or small. Negative exponents are less, so we start with that. Immediately, that eliminates the second and third options as -8 is less than -6 and 3. The last two numbers given in the first and last options, however, both have 3 as the exponent. Now, we look at the number given in front. 2.5 is less than 7, so we know that the first option is in order from least to greatest.
one gym membership charges $10 a month with a sign-up fee of $45. Another gym does not charge patrons a sign-up fee but costs $25 a month. at what month is the total cost of both memberships the same?
Answer:
3 months
Step-by-step explanation:
graph the line of best fit
Answer:
something like this
Step-by-step explanation:
you want the line to go as close to as many dots as possible
Eric throws a biased coin 10 times. He gets 3 tails. Sue throw the same coin 50 times. She gets 20 tails. Aadi is going to throw the coin once.
1. Which one of the following statements is, correct about the probability of Aadi getting Tails?
A. Sue's estimate is best because she throws it 50 times.
B. Sue's estimate is best because she gets more Tails.
C. Sue's estimate is best because she throws it more times than Eric
2. Use Eric's and Sue's results to work out an estimate for the probability that Aadi will get Tails. Write out your fraction in the form a/b.
Sue's estimate is best because she throws it more times than Eric. Regarding the probability of Aadi obtaining tails, Statement C is accurate.
What is probability?The chances of an event occurring are defined by probability. Probability has several uses in games, and in business to create probability-based forecasts.
Ten biased coin throws are made by Eric. He is dealt 3 tails. Sue tosses a coin 50 times. I give her 20 tails.
Aadi will only toss the coin once. Regarding the probability of Aadi obtaining tails.
Sue's estimate is best because she throws it more times than Eric.
Hence option C is correct.
2)
An estimate for the likelihood that Aadi will receive tails using the findings of Eric and Sue. 3/20 will be the fraction of the form a/b.
The probability of the Aadi getting tails;
P(Aadi) = 3 / 360 = 1/120
P(Sue) = 20/50×36 = 1/90
Hence the fraction in the form of a/b willl be 4/3.
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a tank 2m tall stands on the top of a concrete pillar. From point P on the same horizontal ground as the foot of the pillar, the angles of elevation of the top T and bottom B of the tank are 49 degress and 42 degrees respectively. Calculate correct to one decimal place the height of the pillar
Answer:
2
[tex]3 \times 3[/tex]
I want to verify my work answer for the below SSAT question.
Thank you
Cindy throws a rock in the air. The rock's height, y, in feet, with respect to time, x, in seconds can be modeled by the function y=-2x^2+10x+28. When does the rock hit the ground in seconds
My work:
y=-2x^2+10x+28
0= -2(x^2-5x-14) (While knowing that the zero is supposed to be there, I don't understand why 0= -2(x^2-5x-14) )
(x-7)(x+2)
(-7,+2)
I put 2 as the answer, but when checking it was 7?
What part did I do wrong?
Answer:
7
Step-by-step explanation:
You were correct in setting the equation equal to 0 because the problem is asking for when the rock hits the ground and in this problem, you may assume that the ground is y=0, unless the problem says otherwise.
Ok so where you went wrong is that when you factored out and got
(x-7)(x+2), which is correct, you forgot to set these equal to zero (because your actual equation is set to zero). So you should have
x-7 = 0
and
x+2 = 0
and this gives the actual answers +7 and -2. And since time cant be negative its 7 seconds.
This was a silly mistake and happens a lot more often than you think, so I wouldn't worry too much but make sure you practice more, better to lose points on harder questions than easy ones.
Good luck with your exam !
Answer:
7 seconds
Step-by-step explanation:
Given function:
[tex]y=-2x^2+10x+28[/tex]
where:
y = height above the ground (in feet)x = time (in seconds)To find the time when the rock hits the ground, set the equation to zero and solve for x.
First, simplify by factoring out the common term -2:
[tex]\implies -2(x^2-5x-14)=0[/tex]
Divide both sides by -2:
[tex]\implies x^2-5x-14=0[/tex]
To factor a quadratic in the form [tex]ax^2+bx+c[/tex], find two numbers that multiply to ac and sum to b.
[tex]\implies ac=1 \cdot -14=-14[/tex]
[tex]\implies b=-5[/tex]
Therefore, the two numbers that multiply to -14 and sum to -5 are: -7 and 2
Rewrite b as the sum of these two numbers:
[tex]\implies x^2-7x+2x-14=0[/tex]
Factorize the first two terms and the last two terms separately:
[tex]\implies x(x-7)+2(x-7)=0[/tex]
Factor out the common term (x - 7):
[tex]\implies (x+2)(x-7)=0[/tex]
Therefore:
[tex]\implies x+2=0 \implies x=-2[/tex]
[tex]\implies x-7=0 \implies x=7[/tex]
As time cannot be negative, the rock hits the ground in 7 seconds.
S is a subset within a universal set, u. if s = {x, y, 4, 9, ?}, which could describe u?
The set that best describes the universal set U is; U = {keys on a keyboard }
How to determine mathematical sets?We are told that S is a subset within a universal set U.
Now, from the subset S = (x, y, 4, 9, ?), we will need to find among the given sets the one that describes the best set.
From the subset, we see that the Universal set will be keys on a key board due to the fact that the keys on a keyboard will have alphabets, numbers and punctuation marks mentioned in the set.
Therefore U = {keys on a keyboard } will be the correct answer.
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Solve the equation.
–3x + 1 + 10x = x + 4
x = x equals StartFraction one-half EndFraction
x = x equals StartFraction 5 Over 6 EndFraction
x = 12
x = 18
Answer:
x = 1/2
Step-by-step explanation:
-3x + 1 + 10x = x + 4 [given]7x + 1 = x + 4 [combine like terms]6x + 1 = 4 [subtract x from both sides]6x = 3 [subtract 1 from both sides]x = 1/2 [divide both sides by 6)Answer:x = 1/2
Step-by-step explanation: Just took the test on EDGE!!
Ms. Kilicoglu wants to buy a total of 45 volleyballs and basketballs. She has $435 to spend. Each volleyball costs $8 and each basketball costs $11. How many of each type of ball can she purchase?
An equation is formed when two equal expressions. Ms. Kilicoglu will buy 20 volleyballs and 25 basketballs.
What is an equation?An equation is formed when two equal expressions are equated together with the help of an equal sign '='.
Let x be the number of volleyballs and y be the number of basketballs. Therefore, the total number of balls can be written as,
x + y = 45
x = 45 - y
Each volleyball costs $8 and each basketball costs $11. Also, Ms. Kilicoglu has only $435, therefore,
8x + 11y = 435
8(45 - y) + 11y = 435
360 - 8y + 11y = 435
3y = 75
y = 25
Substitute the value of y in the first equation,
x + y = 45
x + 25 = 45
x = 20
Hence, Ms. Kilicoglu will buy 20 volleyballs and 25 basketballs.
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Hi! 6 questions, find the slope of the line through the given points, ty! They should be practice questions
Answer:
3. undefined (vertical line)
4. 1
7. -4
8. 3
11. undefined (vertical line)
12. -1/3
Step-by-step explanation:
You can use the slope formula to calculate the slope which is (y2-y1)/(x2-x1)
3. (-4 - (-2)) / (6-6) denominator is 0 here so the slope is undefined (vertical line)
4. (7 - 1) / (-2 - (-4)) = 6 / 6 = 1
7. (1 - (-7)) / (2 - 4) = 8 / -2 = -4
8. (-1 - 5) / (0 -2 ) = -6 / -2 = 3
11. (3 - 0) / (-6 - (-6)) = 3 / 0 = undefined (vertical line
12. (2 - 3) / (-5 - (-2) = 1 / -3 = -1/3
For her job, natasha spent a total of n minutes processing id card applications and driver's license applications. it takes natasha 15 minutes to process and id card aplication and 20 minutes to process a driver's license application. what is the value of n
Step-by-step explanation:
if I understand the question, write an equation for n in terms of i for number of Id cards an d for number driver license.
n = 15i + 20d
The value of n for a total minutes processing id card applications and driver's license applications would be 35 minutes.
Used the concept of addition that states,
The process of combining two or more numbers is called the Addition. The 4 main properties of addition are commutative, associative, distributive, and additive identity.
Given that,
For her job, Natasha spent a total of n minutes processing id card applications and driver's license applications.
And, it takes Natasha 15 minutes to process an id card application and 20 minutes to process a driver's license application.
Now by the given condition, we get;
n = 15 minutes + 20 minutes
n = 35 minutes
Therefore, the value n is 35 minutes.
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