Time taken by Adam to complete his seventh lap of the circular track as per given data is equal to 1minute 28seconds.
As given in the question,
Time taken by Adam to complete hi first lap of circular track = 1 min 58 sec
First term t₁ = 1 minute 58seconds
Time taken by each successive lap is 5seconds less then the previous lap
Common difference 'd' = -5seconds
let time taken to complete the seventh lap be t₇
t₇ = t₁ + ( 7 - 1 ) d
⇒ t₇ = 1 minute 58 seconds + ( 6 ) (- 5seconds)
= 1 minute 58 seconds - 30seconds
= 1 minute 28 seconds
Therefore, the time taken by Adam to complete his seventh lap is equal to
1 minute 28 seconds.
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Suppose a triangle has two sides of length 7 and 8 and the included angle has a measure of theta degrees. What is the maximum area of the triangle?
28sinθ is the maximum area of the triangle
What is Triangle?A triangle is a three-sided polygon that consists of three edges and three vertices.
Given,
The two sides of triangle are of length 7 and 8.
Triangle has an included angle has a measure of θ degrees.
We need to find the maximum area
A=1/2×7×8×sinθ
A equal to one by two time of seven times of eight times sin theta.
A=7×4×sinθ
A=28sinθ
Hence, 28sinθ is the maximum area of the triangle
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(b) assume 90 companies were included in the sample. what is the test statistic? (round your answer to three decimal places.)
A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive office (CEO) was at least nine years.
a) The hypotheses that can be used to challenge the validity of the claim made by the shareholders' group.
H₀ : u ≤ 9
Hₐ : u > 9
So, the correct option is option (A).
b) T- statistic value is -2.571 for a sample of 90 companies.
c) The critical value for t i.e P-value is 0.0059
d) P-value < α = 0.01, implies reject the null hypothesis. We can conclude that the mean tenure of a CEO is significantly lower than 9 years. The claim of the shareholders group is not valid. So, the correct option is option(D).
We have given that,
x-bar= 7.27 , σ = 6.38, n = 90
a) Test that the mean tenure for a chief executive officer (CEO) was atleast nine years .
Null and alternative hypothesis is
H₀ : u <= 9
Hₐ : u > 9
b) test statistic:
t =( x-bar - μ ) /σ/√n
=> t = (7.27 - 9 )/6.38/90
=> t = - 1.73/0.67251
=> t = -2.571
c) P-value :
P-value = P( tₙ₋₁ < t) = P(t₉₀₋₁ < t )
=> P-value = P( t₈₉< - 2.571)
=>P-value = P( t₈₉ >2.571)
=> P-value = 1 - P( t₈₉< 2.571)
P-value = 1 - 0.9941 = 0.0059
d) Significance level, = 0.01
we see that p-value= 0.0059 < 0.01
Decision : Reject the null hypothesis H₀
We have no evidence to support the claim.
Hence, we calculate all the required result.
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Complete Question :
A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive office (CEO) was at least nine years. A survey of companies reported in The Wall Street Journal found a sample mean tenure of x = 7.27 yearsfor CEOs with a standard deviation of
s = 6.38 years.
(a)Formulate hypotheses that can be used to challenge the validity of the claim made by the shareholders' group. multiple choice:
i)H0: μ ≤ 9
Ha: μ > 9
ii)H0: μ ≥ 9
Ha: μ < 9
iii) H0: μ > 9
Ha: μ ≤ 9
iv)H0: μ < 9
Ha: μ ≥ 9
v) H0: μ = 9
Ha: μ ≠ 9
(b)Assume 90 companies were included in the sample. What is the test statistic? (Round your answer to three decimal places.)
c)What is the p-value for your hypothesis test? (Round your answer to four decimal places.)
p-value =
(d) At = 0.01,what is your conclusion? MULTIPLE CHOICE:
Do not reject H0. We cannot conclude that the mean tenure of a CEO is significantly lower than 9 years. The claim of the shareholders group is valid.Reject H0. We can conclude that the mean tenure of a CEO is significantly lower than 9 years. The claim of the shareholders group is not valid.send help im abt to expire
i don't understand what this is-
Answer:
y < -1x + 2
y [tex]\geq \\[/tex] 2x + 4
Step-by-step explanation:
The steps taken to find the two inequalities are on the GraphInequalities worksheet. The derived equations are graphed on DESMOS and attached, for comparison.
The basic steps are to find the slopes of the two lines and to identify the y-intercepts from the graph. The inequalities can be assigned based on the darkened areas and presence of either a solid or dashed line. All are outlined in the worksheet.
-(4x+20) < −7(x + 15/7)
Answer: x < 5/3
Step-by-step explanation:
-(4x + 20) < −7(x + 15/7) ............................ Question
-4x - 20 < -7(x + 15/7) ................................ Distribute
-4x - 20 < -7x - 15 ...................................... Distribute
-4x - 20 + 20 < -7x - 15 + 20 ................... Add 20 to both sides
-4x < -7x + 5 ............................................... Simplify
-4x + 7x < -7x + 5 + 7x ............................. Add 7x to both sides
3x < 5 .......................................................... Simplify
3x / 3 < 5 / 3 .............................................. Divide both sides by the same factor
x < 5/3 ......................................................... Simplify
Construct a truth table for the following expression: (A + B) · A
the truth table of expression (A+B).A is T ,T ,F,F . A truth table has one column for each input variable (such as P and Q) and a final column that lists all potential outcomes.
what is Truth table ?Truth tables are mathematical tables that are used in logic, specifically in relation to Boolean algebra, Boolean functions, and propositional calculus. They contain the functional values of logical expressions on each of their functional arguments, or more specifically, for each combination of values that their logical variables can take.
given
( A+B) . A
A B (A + B) (A+B).A
T T T T
T F T T
F T T F
F F F F
So , the truth table of expression (A+B).A is T ,T ,F,F .
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About how much longer is QT than RS? Use an approximation rounded to the nearest tenths place
Answer:
Step-by-step explanation:
Please help me with this problem
Answer:
the answer is number three
Step-by-step explanation:
820×10 = 8200
calculate the double integral. 6x 1 + xy da, r = [0, 6] × [0, 1] r
The value after double integration is 45.73
We can evaluate rectangle integrals in any order we like in Cartesian coordinates. We treat the other integral as a constant regardless of which integral we assess first; this is something to keep in mind while choosing the order of integration.
We want that x to be constant; we can easily integrate with respect to y. So we will evaluate y first. We get:
[tex]\int\limits^ \int\limits^ \frac{6x}{1+xy} dA=6\int\limits^6_0 \int\limits^1_0 {\frac{x}{1+xy} } \, dydx[/tex]
[tex]or, 6\int\limits^6_0 {[In(1+xy)}_{0} ^{1} ]} \, dx[/tex]
[tex]or, 6\int\limits^6_0 {In(1+x)} } \, -In 1dx[/tex]
[tex]or, 6\int\limits^6_0 {In(1+x)} } \, dx[/tex]
[tex]or,[(1+x)In(1+x)-(1-x)]^{6} _{0}[/tex]
[tex]or,[7In7-In1-7+1]\\or,6(7In7-6)\\or,45.73[/tex]
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Which graph shows a decreasing function in interval (1), an increasing function in interval (2), a constant function in interval (3), and a decreasing function in interval (4)?
The graph that shows the function with the determined behavior is the last graph, circled on the image given at the end of the answer.
How to determine the behavior of the function?The graph of a function is classified as either increasing, decreasing or constant, as follows:
Increasing: as x increases the function increases, that is, the graph moves up.Decreasing: as x increases the function decreases, that is, the graph moves down.Constant: as x increases the function remains constant, that is, the graph stays at the same position.Hence the fourth graph on the image given at the end of the answer is the one with the desired behavior on each interval.
Missing InformationThe graphs are given by the image shown at the end of the answer.
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Amir spent a total of $53.75 on breakfast sandwiches and bagels for his friends who are visiting from out of town. Each breakfast sandwich costs $4.25, and each bagel costs $2.00. He bought 5 more bagels than breakfast sandwiches.
Write a system of equations that could be used to solve for the number of breakfast sandwiches and bagels he bought.
And solve the system of equations to determine how many bagels and sandwiches Amir bought.
The system of equations is:
2b + 4.25s = 53.75
b - s = 5
The number of bagels bought is 12 and the number of sandwiches bought is 7.
How many bagels and sandwiches were bought?2b + 4.25s = 53.75 equation 1
b - s = 5 equation 2
Where:
n = number of bagels bought s = number of sandwiches boughtThe elimination method would be used to determine the required values.
Multiply equation 2 by 2
2b - 2s = 10 equation 3
Subtract equation 3 from equation 1 :
6.25s = 43.75
Divide both sides of the equation by 2.25
s = 43.75 / 6.25
s = 7
Substitute for s in equation 1:
2b + 4.25(7) = 53.75
2b + 29.75 = 53.75
2b = 53.75 - 29.75
2b = 24
b = 24 / 2
b = 12
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Two groups of runners leave the same locker room heading in opposite directions. Group A runs 4.6 miles due
east, then turns 40° toward north and runs 2.1 miles. Group B runs 4.6 miles due west, then turns 50° toward
south and runs 2.1 miles. Which group is farther from the locker room?
Using law of cosines, the group that is farther from the locker room is; Group B
How to use Law of Cosines?The law of cosines gives that;
c² = a² + b² - 2ab cos C
Now, for group A, we can use law of cosine to find their current distance from the locker room as;
a² = 4.6² + 2.1² - 2(4.6*2.1)*cos 40°
a² = 21.16 + 4.41 - 14.8
a = √10.77
a = 3.28 miles
Similarly, for Group B, we have;
b² = 4.6² + 2.1² - 2(4.6*2.1)*cos 50°
b² = 21.16 + 4.41 - 12.42
b = √13.15
b = 3.63 miles
This means that group B is farther from the locker room
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x-2y<-6 what does y equal?
Answer:
[tex]y > 3+\frac{x}{2}[/tex]
Hope this helps!
Answer: x<2y-6
Step-by-step explanation:
x-2y<-6
=(x-2y)+6<-6+6
=x-2y+6<0
=(x-2y+6)+(2y-6)<2y-6
=x-2y+6+2y-6<2y-6
=x-2y+2y+6-6<2y-6
=x<2y-6
Add.
(3x²-2x) + (4x - 3)
A. 3x² + 2x - 3
B. 3x² - 6x +3
C. 12x³-14x² + 6x
D. 7x² - 5x
i've asked 55 students on monday whether they did their homework over the weekend. 17 of them said they did. find a 67% confidence interval for the proportion of students who will tell me that they did their homework over the weekend.
We are 67% confident that the proportion of students who are tell me that they did their homework over the weekend.0.087 with a margin of error of 0.0175
Find the confidence interval ?In statistics, a confidence interval describes the likelihood that a population parameter would fall between a set of values for a given percentage of the time.
Confidence ranges that include 95% or 99% of anticipated observations are frequently used by analysts.
87/1000 = 0.087
We have a 67% confidence level that the percentage of left-handed students is 0.087, with a 0.0175 margin of error.
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allen and ben are painting a fence. the ratio of the amount of work allen does to the amount of work ben does is $3:5$. if the fence requires a total of $240$ square feet to be painted, how many square feet does ben paint?
The fence Ben paints is 150 square feet.
Given:
ratio of the amount of work allen does to the amount of work ben does is 3:5
allen : ben = 3:5
total work done in ratio = 3 + 5 = 8
Count the fence Ben paints
Since , fence requires a total of 240 square feet to be painted
Thus, ben = ratio of ben/ total ratio × total of works
ben = 5/8 × 240
ben = 1,200/8
ben = 150
Hence , The fence Ben paints is 150 square feet .
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Find the inverse of the following, if it exists.
The inverse matrix R⁻¹ does not exist
What is the inverse of a matrix?The inverse of a matrix written as A⁻¹ is such that when the inverse matrix multiplies A, the result is the identity matrix.
How to find the inverse of the following, if it exists?Given the matrix [tex]R = \left[\begin{array}{ccc}0&0\\1&3\end{array}\right][/tex], to determine if this matrix has an inverse it must satisfy the following condition.
Condition for matrix to have an inverseFor a matrix A to have an inverse, its determinant must not be equal to zero. That is det(A) ≠ 0
So, to determine if the above matrix has an inverse, its determinant must not equal zero.
So, the determinant of the matrix det(R) = 0 × 3 - 0 × 1
= 0 - 0
= 0
Since the determinant equals zero, thus we see that its inverse R⁻¹ does not exist
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An agent is paid a commission of 2% on the total sales in a year and a bonus of 0.5% on the excess of sales over Rs. 9,00,000. Find how much he receives as commission if the bonus amounts is Rs. 1500.
Ans:Rs.24000
In the first week of July, a record 1060 people went to the local swimming pool. In the second week, 100 fewer people went to the pool than in the first week. In the third week, 130 more people went to the pool than in the second week. In the fourth week, 348 fewer people went to the pool than in the third week. What is the percent decrease in the number of people who went to the pool over these four weeks?
The percent decrease in the number of people who went to the pool over these four weeks is 30%.
How to calculate the percentage?From the information given, in the the first week of July, a record 1060 people went to the local swimming pool. In the second week, 100 fewer people went to the pool than in the first week. In the third week, 130 more people went to the pool than in the second week. In the fourth week, 348 fewer people went to the pool than in the third week
The total number of people at the end of the week will be:
= 1060 - 100 + 130 - 348
= 742
The percentage decrease will be:
Decrease / Original value × 100
= (1060 - 742) / 1060 × 100
= 30%
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At the circus, the McCartney family bought bags of cotton candy and funnel cakes for. The Lennon family bought bags of cotton candy and funnel cakes for. Which system of equations could be used to find the cost of each item?
The system of equations which is used to find out the cost of each item (i.e cotton candy and funnel cake) bought by two families McCartney and Lennon Family is
3c + 2f = $24
2c + 4f = $32
We have given that
McCartney family bought
total number of bags of cotton = 3
total number of funnel cakes = 2
total cost of 3 bags and 2 funnel cakes is $24.
Lennon Family bought
total number of bags = 2
total number of funnel cake = 4
total cost of 2 bags and 4 funnel= $32
we have to find out the system of equations which used to find the cost of each item.
let the cost of each funnel cake be f and cotten candy be c .
then, using the above data we get
3c + 2f = $24 ---(1)
2c + 4f = $32 --(2)
Hence, equation (1) and (2) make a system of linear equations which is used to determine the cost of each item.
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Complete question:
HEME At the circus, the McCartney family bought 3 bags of cotton candy and 2 funnel cakes for $24. The Lennon Family bought 2 bags of cotton candy and 4 funnel cakes for $32. Which system of equations could be used to find the cost of each item? Let f represent funnel cake and c represent cotton candy
HELP HURRY ITS TIMED
The length of the side AB represented by x in the triangle ABC is equal to 16 using the trigonometric ratio of sine.
Trigonometric ratiosThe trigonometric ratios involves the relationship of an angle of a right-angled triangle to ratios of two side lengths. Basic trigonometric ratios includes; sine cosine and tangent.
The triangles ABC and ADB are right-angled triangles, we shall be considering the trigonometric ratio of the sine of angle A which is common to both triangles.
For triangle ABC;
sinA = adjacent/hypotenuse
sinA = x/32
for triangle ADB;
sinA = 8/x
thus we can say that;
x/32 = 8/x {cross multiplication}
x² = 3 × 32
x² = 256
x =√256 {take square root for both sides}
x = 16.
Therefore, 16 is the length of the side AB labelled x, using the trigonometric ratio of sine of the common angle A to the triangles ABC and ADB.
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Can square root of 34 be simplified?
Answer:
are you stupif? no dumas
Step-by-step explanation:
SHOW WORK FOR BRAINLIST AND HEARTS!
The value of the function h(x) = -3(x - 1) + 4 when x is -5 is 19.
How to find the value of the function?It is important to note that a function is the statement that illustrates the variables given. In this case, two or more components are taken into consideration to describe the scenario.
In this situation, the function is given a :
h(x) = -3(x - 1) + 4
When x = -5. This will be:
h(-5) = -3(-5 - 1) + 4
= -3(-6) + 1
= 18 + 1
= 19
The value is 19.
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i really need help plsss help me
The linear equation that represents the total cost of the gas will be y = 15.7x.
What is a linear equation?A connection between a number of variables results in a linear model when a graph is displayed. The variable will have a degree of one.
The linear equation is given as,
y = mx + c
Where m is the slope of the line and c is the y-intercept of the line.
The cost of two gallons of gas is $31.40. Then the rate (slope) is given as,
m = $31.40 / 2
m = $15.7 for each gallon
Let 'x' be the number of gallons of gas and 'y' be the total cost. Then the equation is given as,
y = 15.7x
The linear equation that represents the total cost of the gas will be y = 15.7x.
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34% of all college students major in stem (science, technology, engineering, and math). if 40 college students are randomly selected, find the probability that
If the 34% of the college students major in STEM than the probability that exactly 15 of them major in STEM is 0.1162 .
In the question ,
it is given that ,
percent of students that major in STEM is = 34% ;
that means , p = 0.34 ; so , q = 0.6
number of students randomly selected (n) = 40 ,
By the Binomial Probability Distribution ,
we get ;
p(x = 15) = ⁴⁰C₅*(0.34)¹⁵*(0.66)²⁵
Simplifying the above value further ,
we get ;
p(x = 15) = 0.1162 .
Therefore , the required probability is 0.1162 .
The given question is incomplete , the complete question is
The 34% of all college students major in stem (science, technology, engineering, and math). if 40 college students are randomly selected, find the probability that exactly 15 of them major in stem .
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the air temperature is 70 degrees, and the relative humidity is 90%. which conclusion can be made?(1 point)
The conclusion that can be made from the given observations is that the dew factor temperature is 90% of the air temperature.
Humidity is the quantity of water vapor withinside the air. If there is lots of water vapor withinside the air, the humidity might be high.
The temperature have to upward push so as for air to come to be saturated with water vapor.
The air holds little water vapor and is rather dry.
The quantity of water vapor withinside the air is 90% of what the air can hold.
The dew factor temperature is 90% of the air temperature.
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the zip codes of a sample of 345 customers at pet shop are an example of qualitative variables. True or False
False, the zip codes of a sample of 345 customers at pet shop are not an example of qualitative variables
The zip codes of a sample of 345 customers at a pet shop are an example of quantitative variables because they are numerical values that can be measured and compared. Qualitative variables, on the other hand, are categorical variables that describe a characteristic or attribute of a person, place, or thing, such as gender, color, or nationality. They cannot be measured numerically and are often described using words or labels.
Qualitative Variables: Qualitative variables are variables that are not numerical or quantifiable. Examples of qualitative variables include gender, race, eye color, ethnicity, nationality, marital status, and religious preference.
Quantitative Variables: Quantitative variables are variables that are numerical or quantifiable. Examples of quantitative variables include height, weight, age, income, income level, GPA, number of children, and number of hours worked.
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What is the area of the figure?
Answer:
252 in.²
Step-by-step explanation:
12 in. by 21 in. rectangle
The 6 in. by 3 in. rectangle missing on the left bottom corner is made up by the same-sized rectangle on the right side.
A = LW
A = 21 in. × 12 in.
A = 252 in.²
On a coordinate grid, line j passes through points (8, 2) and (-2,-2). On the same grid, line k
passes through points (-4, 3) and (-6, 8). Are lines j and k parallel, perpendicular, or neither?
Answer: lines j and k are perpendicular
Step-by-step explanation:
Let's find the equations of lines j and k
[tex]\displaystyle\\\boxed{\frac{x-x_1}{x_2-x_1}=\frac{y-y_1}{y_2-y_1} }[/tex]
Line j: (8,2) (-2,-2)
x₁= 8 x₂=-2 y₁=2 y₂=-2
[tex]\displaystyle\\\frac{x-8}{-2-8}=\frac{y-2}{-2-2} \\\\\frac{x-8}{-10}=\frac{y-2}{-4} \\\\[/tex]
Multiply both parts of the equation by -4:
[tex]\displaystyle\\\frac{2}{5} (x-8)=y-2\\\\\frac{2}{5} x-\frac{16}{5} =y-2\\\\\frac{2}{5} x-3.2+2=y-2+2\\\\\frac{2}{5}x-1.2=y\\\\ Thus,\ y=\frac{2}{5}x-1.2[/tex]
Line k: (-4,3) (-6,8)
x₁=-4 x₂=-6 y₁=3 y₂=8
[tex]\displaystyle\\\frac{x-(-4)}{-6-(-4)} =\frac{y-3}{8-3} \\\\\frac{x+4}{-6+4}=\frac{y-3}{5} \\\\\frac{x+4}{-2} =\frac{y-3}{5}[/tex]
Multiply both parts of the equation by 5:
[tex]\displaystyle\\-\frac{5}{2}(x+4)=y-3\\\\ -\frac{5}{2}x-10=y-3\\\\ -\frac{5}{2}x-10+3=y-3+3\\ -\frac{5}{2}x-7=y\\Thus,\ y=-\frac{5}{2} x-7[/tex]
Hence, lines j and k are perpendicular
Please help,100 points will give the brainiest.
Given the equation, 3x2 + 4x – 2 = 0, calculate the discriminant and determine the number and nature of the solutions.
1.d = 40; 2 irrational
2.d = 40; 2 rational
3.d = −8; 2 complex
Answer:
1. d = 40; 2 irrational
Step-by-step explanation:
[tex]\boxed{\begin{minipage}{7.6 cm}\underline{Discriminant}\\\\$b^2-4ac$ \quad when $ax^2+bx+c=0$\\\\when $b^2-4ac > 0 \implies$ two real solutions.\\when $b^2-4ac=0 \implies$ one real solution.\\when $b^2-4ac < 0 \implies$ no real solutions.\\\end{minipage}}[/tex]
Given quadratic equation:
[tex]3x^2+4x-2=0[/tex]
Therefore:
a = 3b = 4c = -2Substitute the values of a, b and c into the discriminant formula:
[tex]\begin{aligned}\implies b^2-4ac&=(4)^2-4(3)(-2)\\&=16-12(-2)\\&=16+24\\&=40\end{aligned}[/tex]
Therefore, as d = 40 and 40 > 0:
[tex]\implies b^2 - 4ac > 0 \implies \text{two real solutions}.[/tex]
To determine if the solutions are irrational or rational, simply square root the discriminant.
[tex]\implies \sqrt{d}=\sqrt{40}=2 \sqrt{10}[/tex]
As the discriminant is not a perfect square, then its square root is irrational and so the solutions of the quadratic equation are irrational.
jordan ran 78 mile on monday and 56 mile on tuesday. how much farther did jordan run on monday than on tuesday? enter your answer as a fraction in simplest form by filling in the boxes. $$ mile
After subtracting the fractions, we know that Jordan runs 1/24 miles more on Monday than Tuesday.
What are fractions?Any number of equal parts is represented by a fraction, which also represents a portion of a whole.
A fraction, such as one-half, eight-fifths, or three-quarters, indicates how many components of a particular size there are when stated in ordinary English. Both are integers in a simple fraction.
A fraction appears in the numerator or denominator of a complex fraction.
The numerator of a proper fraction is less than the denominator.
So, we know that:
Jordan runs on Monday: 7/8 miles
Jordan runs on Tuesday: 5/6 miles
Jordan runs more on Monday:
7/8 - 5/6
3*7 - 4*5/24
21 - 20/24
1/21 miles
Therefore, after subtracting the fractions, we know that Jordan runs 1/24 miles more on Monday than Tuesday.
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Correct question:
Jordan ran 7/8 miles on Monday and 5/6 miles on Tuesday.
How much farther did Jordan run on Monday than on Tuesday?
Enter your answer as a fraction in simplest form.