Calculus

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Short Answer: Type your answer below each question. Show your work.

 

1

Verify the identity.

 

cot θ ∙ sec θ = csc θ



 

 

 

 

 

 

 


2

A gas company has the following rate schedule for natural gas usage in single-family residences:

 

                Monthly service charge                  $8.80

 

                Per therm service charge

                                1st 25 therms                      $0.6686/therm

                                Over 25 therms                  $0.85870/therm

 

What is the charge for using 25 therms in one month?

What is the charge for using 45 therms in one month?

Construct a function that gives the monthly charge C for x therms of gas.



 

 

 

 

 

 

 

 

 

 

 


3

The wind chill factor represents the equivalent air temperature at a standard wind speed that would produce the same heat loss as the given temperature and wind speed. One formula for computing the equivalent temperature is

 

W(t) =  

 

where v represents the wind speed (in meters per second) and t represents the air temperature . Compute the wind chill for an air temperature of 15°C and a wind speed of 12 meters per second. (Round the answer to one decimal place.)



 

 

 

 


4

Complete the following:

(a)           Use the Leading Coefficient Test to determine the graph's end behavior.

(b)           Find the x-intercepts. State whether the graph crosses the x-axis or touches the x-axis and turns around at each intercept.

(c)           Find the y-intercept.

f(x) = x2(x + 2)


(a).

 

 

 

 

(b).

 

 

 

 

(c).

 

 

 

 

 

 

 

 


5

For the data set shown by the table,

 a. Create a scatter plot for the data. (You do not need to submit the scatter plot)

 b. Use the scatter plot to determine whether an exponential function or a logarithmic function is the best choice for modeling the data.

Number of Homes Built in a Town by Year



 

 

 

 


6

Verify the identity.

(1 + tan2u)(1 - sin2u) = 1



 

 

 


7

Verify the identity.

cot2x + csc2x = 2csc2x - 1

 

 

 

 


8

Verify the identity.

1 + sec2xsin2x = sec2x



 

 

 


9

Verify the identity.

cos(α - β) - cos(α + β) = 2 sin α sin β



 

 

 

 

 

 


10

The following data represents the normal monthly precipitation for a certain city.

 

Draw a scatter diagram of the data for one period. (You do not need to submit the scatter diagram). Find the sinusoidal function of the form  that fits the data.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Multiple Choice: Type your answer choice in the blank next to each question.

 

_____11.

The graph below shows the percentage of students enrolled in the College of Engineering at State University. Use the graph to answer the question.



Does the graph represent a function?

A. Yes

 

B. No

 

 


_____12.

Find the vertical asymptotes, if any, of the graph of the rational function.

f(x) =

A. x = 0 and x = 4

 

B. x = 0

 

C. x = 4

 

D. no vertical asymptote

 

 

 

 

 

 

 

 

 

 


_____13.

The formula A = 118e0.024t models the population of a particular city, in thousands, t years after 1998. When will the population of the city reach 140 thousand?

A. 2008

 

B. 2005

 

C. 2006

 

D. 2007

 

_____14.

Find the specified vector or scalar.

u = -4i + 1j and v = 4i + 1j; Find
.

A.

 

B. 8

 

C. 2

 

D. 5

 

_____15.

Find the exact value of the trigonometric function. Do not use a calculator.

 

A. -1

 

B.

 

C. 1

 

D.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

_____16.

Find the x-intercepts (if any) for the graph of the quadratic function.

6x2 + 12x + 5 = 0

Give your answers in exact form.

A.   

 

 

B.  

 

 

C.  

 

 

D.  

 

_____17.

Use the compound interest formulas A = Pert and A = P to solve.

Suppose that you have $11,000 to invest. Which investment yields the greater return over 10 years: 6.25% compounded continuously or 6.3% compounded semiannually?

A. $11,000 invested at 6.25% compounded continuously over 10 years yields the greater return.

 

B. Both investment plans yield the same return.

 

C. $11,000 invested at 6.3% compounded semiannually over 10 years yields the greater return.

 

_____18.

Find functions f and g so that h(x) = (f g)(x).

h(x) = (6x - 14)8

A. f(x) = 6x - 14, g(x) = x8

 

B. f(x) = 6x8 - 14, g(x) = -14

 

C. f(x) = x8, g(x) = 6x - 14

 

D. f(x) = (6x)8, g(x) = -14

 

 

_____19.

Begin by graphing the standard absolute value function f(x) = | x |. Then use transformations of this graph to graph the given function.

h(x) = 2 | x | + 2

A.  

 

B.  

 

C.  

 

D.  

 

_____20.

Find the reference angle for the given angle.

-404°

A. 44°

 

B. 46°

 

C. 134°

 

D. 136°

 
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