MA 105 WEEK 8

Question 1


 


Select the correct description of right-hand and left-hand behavior of the graph of the polynomial function.


https://content.grantham.edu/at/MA105/exams/w8_1.jpg


 

Rises to the left, falls to the right

 

Rises to the right, rises to the left

 

Falls to the left, rises to the right

 

Falls to the right

 

Falls to the left, falls to the right


Question 2


 


Select the correct description of right-hand and left-hand behavior of the graph of the polynomial funciton.


f(x) = 4x2 - 5x + 4


 

Falls to the left, rises to the right

 

Falls to the left, falls to the right

 

Rises to the left, rises to the right

 

Rises to the left, falls to the right

 

Falls to the left


Question 3


 


Find all the real zeroes of the polynomial function.


f(x) = x2 - 25


 

-25

 

5

 

-5

 

25

 

±5


Question 4


 


Use synthetic division to divide.


(4x3 + x2 - 11x + 6) ÷ (x + 2)


 

4x2 - 5x - 6

 

4x2 - 7x + 3

 

4x2 - 2x - 2

 

4x2 + 5x - 12

 

4x2 + 7x - 4


Question 5


 


Use the Remainder Theorem and synthetic division to find the function value.  Verify your answers using another method.


h(x) = x3 - 6x2 - 5x + 7


h(-8)


 

-849

 

-847

 

-851

 

-848

 

-845


Question 6


 


Find all the rational zeroes of the function.


x3 - 12x2 + 41x - 42


 

-2, -3, -7

 

2, 3, 7

 

2, -3, 7

 

-2, 3, 7

 

-2, 3, -7


Question 7


 


The total revenue R earned (in thousands of dollars) from manufacturing handheld video games is given by 


R(p) = -25p2 + 1700p


where p is the price per unit (in dollars).


Find the unit price that will yield a maximum revenue.


 

$38

 

$35

 

$36

 

$37

 

$34


Question 8


 


Find the domain of the function https://content.grantham.edu/at/MA105/exams/w8_8.jpg


 

Domain: all real numbers x except x = 7

 

Domain: all real numbers x except x = ±49

 

Domain: all real numbers x except x = ±8

 

Domain: all real numbers x except x = -7

 

Domain: all real numbers x except x = ±7


Question 9


 


Find the domain of the function and identify any vertical and horizontal asymptotes.


https://content.grantham.edu/at/MA105/exams/w8_9.jpg


 

Domain: all real numbers x

Vertical asymptote: x = 0

Horizontal asymptote: y = 0

 

Domain: all real numbers x except x = 2

Vertical asymptote: x = 0

Horizontal asymptote: y = 0

 

Domain: all real numbers x except x = 5

Vertical asymptote: x = 0

Horizontal asymptote: y = 2

 

Domain: all real numbers x

Vertical asymptote: x = 0

Horizontal asymptote: y = 2

 

Domain: all real numbers x except x = 5

Vertical asymptote: x = 5

Horizontal asymptote: y = 0


Question 10


 


Simplify f and find any vertical asymptotes of f.


https://content.grantham.edu/at/MA105/exams/w8_10.jpg


 

x+3; vertical asymptote: x = -3

 

x; vertical asymptote: none

 

x; vertical asymptote: x = -3

 

x-3; vertical asymptote: none

 

x2; vertical asymptote: none


Question 11


 


Determine the equations of any horizontal and vertical asymptotes of


https://content.grantham.edu/at/MA105/exams/w8_11.jpg


 

horizontal: y = 5; vertical: x = 0

 

horizontal: y = 1; vertical: x = -5

 

horizontal: y = 1; vertical: x = 1 and x = -5

 

horizontal: y = -1; vertical: x = -5

 

horizontal: y = 0; vertical: none


Question 12


 


Identify all intercepts of the following function.


https://content.grantham.edu/at/MA105/exams/w8_12.jpg


 

x-intercepts: (±3, 0)

 

no intercepts

 

x-intercepts: (-3,0)

 

x-intercepts: (0,0)

 

x-intercepts: (3,0)


Question 13


 


Select the correct graph of the function.


https://content.grantham.edu/at/MA105/exams/w8_13.jpg


 

https://content.grantham.edu/at/MA105/exams/w8_13_a.jpg

 

https://content.grantham.edu/at/MA105/exams/w8_13_b.jpg

 

https://content.grantham.edu/at/MA105/exams/w8_13_c.jpg

 

https://content.grantham.edu/at/MA105/exams/w8_13_d.jpg

 

https://content.grantham.edu/at/MA105/exams/w8_13_e.jpg


Question 14


 


The game commission introduces 100 deer into newly acquired state game lands.  The population N of the herd is modeled by


https://content.grantham.edu/at/MA105/exams/w8_14.jpg


where t is the time in years.  Find the populations when t=40.  (Round your answer to the nearest whole number.)


 

1,442 deer

 

1,632 deer

 

1,594 deer

 

1,550 deer


Question 15


 


Evaluate the function at the indicated value of x.  Round your result to three decimal places.


Function: f(x) = 6000(6x)    Value: x = -1.3


 

584.191

 

784.191

 

-584.191

 

684.191

 

-784.191


Question 16


 


Select the graph of the function.


https://content.grantham.edu/at/MA105/exams/w8_16.jpg


 

https://content.grantham.edu/at/MA105/exams/w8_16_a.jpg

 

https://content.grantham.edu/at/MA105/exams/w8_16_b.jpg

 

https://content.grantham.edu/at/MA105/exams/w8_16_c.jpg

 

https://content.grantham.edu/at/MA105/exams/w8_16_d.jpg

 

https://content.grantham.edu/at/MA105/exams/w8_16_e.jpg


Question 17


 


Use the One-to-One Property to solve the equation for x.


ex2-6 = e5x


 

x = -6

 

x = 5

 

x = 6, -1

 

x = -6, -1

 

x = -6,1


Question 18


 


log366 = 1/2


 

36½ = -6

 

36½ = 6

 

6½ = 36

 

36½ = -1/6

 

36½ = 1/6


Question 19


 


Write the exponential equation in logarithmic form.


272 = 729


 

log27729 = 2

 

log27729 = 1/2

 

log72927 = 2

 

log27729 = -2

 

log272 = 729


Question 20


 


Find the exact value of the logarighmic expression without using a calculator.


4 ln e7


 

7

 

28

 

4

 

e

 

1


Question 21


 


Condense the expression to the logarithm of a single quantity.


ln310 + ln3x


 

ln3(10 - x)

 

ln310/x

 

ln3(10 + x)

 

ln310x

 

ln310x


Question 22


 


Solve for x.


6x = 1,296


 

6

 

10

 

4

 

-6

 

-4


Question 23


 


Solve the exponential equation algebraically.  Approximate the result to three decimal places.


ex - 8 = 12


 

ln20 ≈ 2.485

 

ln20 ≈ 2.996

 

ln20 ≈ -2.485

 

ln20 ≈ 2.079

 

ln20 ≈ -2.996


Question 24


 


An initial investment of $9000 grows at an annual interest rate of 5% compounded continuously.  How long will it take to double the investment?


 

1 year

 

14.40 years

 

13.86 years

 

14.86 years

 

13.40 years


 


Question 25


 


The populations (in thousands) of Pittsburgh, Pennsylvania from 2000 through 2007 can be modele by https://content.grantham.edu/at/MA105/exams/w8_25.jpg  where t represents the year, with t = 0 corresponding to 2000.  Use the model to find the population in the year 2001.


 

2,418,774

 

2,419,774

 

2,421,774

 

2,420,774


 

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