The median weight of a boy whose age is between 0 and 36 months can be approximated by the function
w(t)=9.66+1.55t−0.0076t2+0.000076t3
where t is measured in months and w is measured in pounds. Use this approximation to find the following for a boy with median weight in parts a) through c) below.
a) The rate of change of weight with respect to time.
w′(t)=□
b) The weight of the baby at age 11 months. The approximate weight of the baby at age 11 months is □ Ibs.
(Round to two decimal places as needed.)
c) The rate of change of the baby's weight with respect to time at age 11 months The rate of change for the baby's weight with respect to time at age 11 months is approximately □ lbs/month.
(Round to two decimal places as needed.)
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Suppose that $2100 is initially invested in an account at a fixed interest rate, compounded continuously. Suppose also that, after two and a half years, the amount of money in the account is $2376. Find the interest rate per year. Write your answer as a percentage. Do not round any intermediate computations, and round your percentage to the nearest hundredth.
□
\% per year
Exercise 1.
Determine limited development in the neighborhood of x0=0 to the indicated order n for the following functions 1. 1+x+x31+x+x2(n=3)I 3. −1+sinxarctan(2x)(n=3), 2. 2−x21+x(n=2) 4. ln(cosx)sh2x(n=2), 5. e2+cosx(n=2) Exercise 2. 1. Determine the limited development in the neighborhood of x0 to the indicated order n of the following functions :
(a) f(x)=cosx,x0=4π,n=3.
(b) x2ln(x)(x0=1,n=3). 2. Determine Determine the limited development in the neighborhood of +∞ to the indicated order n of the following functions :
(a) f(x)=xx+2,n=3
(b) ln(x+1+x2)−lnx(n=4)
Exercise 1.
Determine limited development in the neighborhood of x0=0 to the indicated order n for the following functions 1. 1+x+x31+x+x2(n=3)I 3. −1+sinxarctan(2x)(n=3), 2. 2−x21+x(n=2) 4. ln(cosx)sh2x(n=2), 5. e2+cosx(n=2) Exercise 2. 1. Determine the limited development in the neighborhood of x0 to the indicated order n of the following functions :
(a) f(x)=cosx,x0=4π,n=3.
(b) x2ln(x)(x0=1,n=3). 2. Determine Determine the limited development in the neighborhood of +∞ to the indicated order n of the following functions :
(a) f(x)=xx+2,n=3
(b) ln(x+1+x2)−lnx(n=4)
The fox population in a certain region has an annual growth rate of 5 percent per year. (Note: Foxes mate once per year.) It is estimated that the fox population in the year 2020 was 14000.
(a) Find an exponential function that models the fox population t years after 2020 (Note: t=0 for 2020). The function is P(t)=□
(b) Use the function from part (a) to estimate the fox population in the year 2028. (The answer should be an integer.)
There will be □ foxes in the year 2028.
Find functions f and g so that f∘g=H.
H(x)=(5x+2)4 Choose the correct pair of functions.
A.
f(x)=4x,g(x)=5x−2
C.
f(x)=5x−2,g(x)=4xB.
f(x)=x4,g(x)=5x+2
D.
f(x)=5x+2,g(x)=x4
For f(x)=x and g(x)=4x+1, find the following composite functions and state the domain of each.
(a) f∘g
(b) g∘f
(c) f∘f
(d) g∘g
(a) (f∘g)(x)=□ (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice.
A. The domain of f∘g is {x∣□}.
□
(Type an inequality. Simplify your answer. Use integers or fractions for any numbers in the expression.)
B. The domain of f∘g is all real numbers.
(b) (g∘f)(x)=□ (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice.
A. The domain of g∘f is {x□ \}.
(Type an inequality. Simplify your answer. Use integers or fractions for any numbers in the expression.)
B. The domain of g∘f is all real numbers.
(c) (f∘f)(x)=□ (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice.
A. The domain of f o f is {x□ \}.
(Type an inequality. Simplify your answer. Use integers or fractions for any numbers in the expression.)
B. The domain of f o f is all real numbers.
Find an equation for the graph shown to the right. Type the equation in the form y=Asin(ωx) or y=Acos(ωx).
y=□
(Type an exact answer, using π as needed. Use integers or fractions for any numbers in the expression.)
Find an equation for the graph shown to the right. Type the equation in the form y=Asin(ωx) or y=Acos(ωx).
y=□
(Type an exact answer, using π as needed. Use integers or fractions for any numbers in the expression.)
Find an equation for the graph shown to the right. Type the equation in the form y=Asin(ωx) or y=Acos(ωx).
y=□
(Type an exact answer, using π as needed. Use integers or fractions for any numbers in the expression.)
A fence is to be built to enclose a rectangular area of 250 square feet. The fence along three sides is to be made of material that costs : dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the dimensions of the enclosure that is most economical to construct. Dimensions: □ x □ Preview My Answers
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Suppose that G(x)=log3(2x−1)−3.
(a) What is the domain of G?
(b) What is G(5) ? What point is on the graph of G ?
(c) If G(x)=1, what is x ? What point is on the graph of G ?
(d) What is the zero of G ?
(a) The domain of G is □ . (Type your answer in interval notation.)
(b) G(5)=□
The point □ is on the graph of G. (Type an ordered pair.)
(c) If G(x)=1, then x=□□. The point □ is on the graph of G. (Type an ordered pair.)
(d) The zero of G is x=□□.
The function D(h)=8e−0.51h can be used to find the number of milligrams D of a certain drug that is in a patient's bloodstream h hours after the drug has been administered. How many milligrams will be present after 1 hour? After 7 hours? After 1 hour, there will be □ milligrams.
(Round to two decimal places as needed.)
After 7 hours, there will be □ milligrams.
(Round to two decimal places as needed.)
NASA launches a rocket at t=0 seconds. Its height, in meters above sea-level, as a function of time is given by h(t)=−4.9t2+40t+185. Assuming that the rocket will splash down into the ocean, at that time does splashdown occur?
The rocket splashes down after □ seconds. (Round your answer to 2 decimals.) How high above sea-level does the rocket get at its peak?
The rocket peaks at □ 266.63 0 meters above sea-level. (Round your answer to 2 decimals.) Question Help: □ Video 1 □ Video 2 □ Message instructor
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The table below shows the amount of time each of the 15 students in an introductory biology class spent studying for the first exam, and the student's score on the exam out of 100.
\begin{tabular}{|c|c|}
\hlinex (minutes spent studying) & y (score on exam in points) \\
\hline 150 & 98 \\
\hline 70 & 65 \\
\hline 100 & 74 \\
\hline 120 & 46 \\
\hline 60 & 72 \\
\hline 0 & 52 \\
\hline 10 & 35 \\
\hline 75 & 79 \\
\hline 120 & 80 \\
\hline 45 & 72 \\
\hline 50 & 80 \\
\hline 0 & 30 \\
\hline 10 & 56 \\
\hline 40 & 64 \\
\hline 30 & 81 \\
\hline
\end{tabular} To check this is entered correctly on your calculator, press [stat], go to CALC, and select "2:2-Var Stats". Run this on your two lists. When you scroll down the list, you should see Σxy=65155 Enter the data into your calculator and obtain a linear equation of best fit using the linear regression feature. Type the equation here, in the form y=mx+b. If necessary, round the values of m and b to three decimal places.
□
Based on your regression equation, what score would you predict for a student who has studied for 1 hour and 10 minutes? Round your answer to a whole number of points.
□ points
Based on your regression equation, how much time should a "typical" student spend studying if they wanted to score at least 75 points on the exam? Round your answer up to the next full minute.
□ minutes
(2 points)
Let f(x)=7+x−9. Then find each of the following, giving all domain
(a) f−1(x)=□
(b) The domain of f is □
(c) The domain of f−1 is □
(d) The range of f is □
(e) The range of f−1 is □
Aab-5-wDemo-STA ×∣ Dal Lab 16 - MATH-1018-A01 - Pre-C ×∣ bat Assignment 11 - MATH-1018-A01 ×∣□ My Student Aid
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MATH-018-A01 - PRECCNLOULUS IN PRACTICE
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Use sinusoidal functions to solve real-world applications Question
The equation T=0.6sin(28π(t−1))+101.0 describes the body temperature of a pig in Fahrenheit, where t is time in hours. What is the temperature of the pig to the nearest tenth of a degree when t=3 ? Do not include the units in your answer. NOTE: The angle is in radians. Provide your answer below:
\begin{tabular}{|c|c|c|c|c|c|c|c|}
\hline ( & & \multicolumn{5}{|c|}{✓} & (1) \\
\hline 7 & 8 & 9 & ÷ & x & y & x2 & \\
\hline 4 & 5 & 6 & × & □x & x□□ & x□ & x□ \\
\hline 1 & 2 & 3 & - & < & > & ± & \ \\
\hline 0 & - & , & + & \% & 。 & : & ( \square \\
\hline 4 & - & 6 & = & | | | & \pi$ & ) & \\
\hline
\end{tabular}
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Find the domain of the following rational function.
H(x)=(x−6)(x+2)−8x2 Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A. The domain of H(x) is (x∣x=□ 1. (Type an integer or a fraction, Use a comma to soparal
B. The domain of H(x) has no resitictions.
(2 points)
Let f(x)=3x2+3 and g(x)=2x2+8
Find and simplify each of the following functions:
(a) (f+g)(x)=
(b) (f−g)(x)=
(c) (f⋅g)(x)=
(d) (gf)(x)=
help (formulas)
Use the Intermediate Value Theorem to show that the polynomial f(x)=x3+x2−4x+46 has a real zero between -5 and -2 Select the correct choice below and fill in the answer boxes to complete your choice. □□
A. Because f(x) is a polynomial with f(−5)=□<0 and f(−2)=□<0, the function has a real zero between -5 and -2 .
B. Because f(x) is a polynomial with f(−5)=□□>0 and f(−2)=<0, the function has a real zero between -5 and -2 .
C. Because f(x) is a polynomial with f(−5)=□<0 and f(−2)=□>0, the function has a real zero between -5 and -2 .
D. Because f(x) is a polynomial with f(−5)=□>0 and f(−2)=□>0, the function has a real zero between -5 and -2 .
Question
The equation p=7000cos(10πt)+45000 describes the number of deer in a forest where t is the number of years after 1972. What was the population in the year 1978 to the nearest whole number? NOTE: The angle is in radians. Provide your answer below:
p=□]deer
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(1 point)
Express the function y=4(x−7)5 as a composition y=(f∘g)(x) of two simpler functions.
f(x)=□g(x)=□
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Question
The equation d=5sin(24t) measures the displacement of a swinging pendulum in simple harmonic motion. t is measured in seconds and d is measured in centimeters. What is the displacement, to the nearest centimeter, when t=4 ? NOTE: The angle is in radians. Provide your answer below:
d=□ Icm
A study is done on the number of bacteria cells in a petri dish. Suppose that the population size P(t) after t hours is given by the following exponential function.
P(t)=2500(0.82)t Find the initial population size.
2500 Does the function represent growth or decay?
growth
decay
By what percent does the population size change each hour?
□ \%
Explanation
Check
This question: 1 point(s) possidle Find the zeros for the polynomial function and give the multiplicity for each zero. State whether the graph crosses the x -axis or touches the x -axis and turns around at each zero
f(x)=3(x−6)(x+1)3 Determine the zero(s).
The zero(s) is/are □
(Type integers or decimals. Use a comma to separate answers as needed.)
Determine the multiplicities of the zero(s). Select the correct choice below and, if necessary, fill in the answer box(es) within your choice.
A. There are two zeros. The multiplicity of the largest zero is □ . The multiplicity of the smallest zero is □ .
(Simplify your answers.)
B. There are three zeros. The multiplicity of the largest zero is □ . The multiplicity of the smallest zero is □ . The multiplicity of the other zero is □ .
(Simplify your answers.)
C. There is one zero. The multiplicity of the zero is □ .
(Simplify your answer.)
Determine the behavior of the function at each zero. Select the correct choice below and, if necessary, fill in the answer boxes within your choice.
A. The graph touches the x-axis and turns around at all zeros.
B. The graph crosses the x-axis at all zeros.
C. The graph crosses the x-axis at x=□ and touches the x-axis and turns around at x=□ I.
(Simplify your answers. Type integers or decimals. Use a comma to separate answers as needed.)
Find g(x), where g(x) is the translation 1 unit up of f(x)=4∣x+5∣+8.
Write your answer in the form a∣x−h∣+k, where a,h, and k are integers.
g(x)=
Submit
Given the following data points:
\begin{align*}
&\text{Shoe size (pointure de Soulier): 6, Foot length (longueur du pied): 20, Height (hauteur): 146.5} \\
&\text{Shoe size (pointure de Soulier): 6.5, Foot length (longueur du pied): 24, Height (hauteur): 162} \\
&\text{Shoe size (pointure de Soulier): 7, Foot length (longueur du pied): 22.5, Height (hauteur): 163} \\
&\text{Shoe size (pointure de Soulier): 7, Foot length (longueur du pied): 23, Height (hauteur): 166} \\
&\text{Shoe size (pointure de Soulier): 7, Foot length (longueur du pied): 18, Height (hauteur): 169} \\
&\text{Shoe size (pointure de Soulier): 7, Foot length (longueur du pied): \text{unknown}, Height (hauteur): \text{unknown}}
\end{align*} Using a linear model, predict the height for the last data point with a shoe size of 7. Determine whether interpolation or extrapolation is used in this prediction.
Exercise 2: Streaming Services
A movie streaming service provides one account per household, but multiple people in the same household can use the account to watch their favorite shows. Question:
Is the relation between households and streaming accounts a function? Why or why not?
(1 point) Find two numbers differing by 34 whose product is as small as possible.
Enter your two numbers as a comma separated list, e.g. 2, 3.
The two numbers are □
Cled inly seiection 9
Multiple Choice
1 point An airplane leaves the runway climbing at an angle of θ=10π and with a speed of 275 feet per second. Find the altitude of the plane after 2 minutes. Round your answer to the nearest tenth.
10,197.6 feet
784.6 feet
15,692.4 feet
3386.1 feet Clear my selection
A bacteria culture initially contains 2500 bacteria and doubles every half hour. Find the size of the bacterial population after 40 minutes.
□
Find the size of the bacterial population after 7 hours. □
4. This graph shows the recommended maximum heart rate of a person, R beats per minute, as a function of her or his age, a years, for a stress test.
a. Why are there no intercepts on this graph? [1 mark total]
b. What is the rate of change? What does it represent? [2 marks total]
c. At what age is the recommended maximum heart rate 120 beats /min ?
[1 mark total]
d. What is the approximate recommended maximum heart rate for a person aged 70? [1 mark total]
Select the correct sequence to convert days to seconds: 1. days → seconds 2. days → minutes → hours → seconds 3. days → hours → minutes → seconds 4. days → hours → seconds
Jordan flies 650 miles round-trip. How many trips must he make yearly to fly between 10400 and 28600 miles for Gold status? Express in interval notation.
Determine if each equation defines y as a function of x: 11. x+y=16, 12. x+y=25, 13. x2+y=16, 14. x2+y=25, 15. x2+y2=16, 16. x2+y2=25, 17. x=y2, 18. 4x=y2.
Graph the functions f and g for x from -2 to 2, then describe how g relates to f. Examples: 39. f(x)=x,g(x)=x+3 40. f(x)=x,g(x)=x−4 41. f(x)=−2x,g(x)=−2x−1 42. f(x)=−2x,g(x)=−2x+3 43. f(x)=x2,g(x)=x2+1 44. f(x)=x2,g(x)=x2−2 45. f(x)=∣x∣,g(x)=∣x∣−2
An airplane crosses the Atlantic Ocean (3000 miles) at 560 mph. Cost per passenger with a 100 mph tailwind is given by θ(x)=150+20x+x32,000 What is the cost per passenger? Round to the nearest cent.