AnswersPrecalculusRational Functions

Practice Test Answers

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1
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Identify the horizontal and vertical asymptotes, if any, for the graph of f of x shown. Choose two correct answers.

A
no vertical asymptotes
B
x is equal to 1
C
y is equal to 0
D
x is equal to negative 1
E
no horizontal asymptotes
F
y is equal to 1
2
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Which expression is equivalent to the following complex fraction? the fraction with numerator the fraction with numerator x and denominator x minus 3 and denominator the fraction with numerator x squared and denominator x squared minus 9

A
the fraction with numerator x and denominator x plus 3
B
the fraction with numerator x plus 3 and denominator x
C
the fraction with numerator x plus 3 and denominator 1
D
the fraction with numerator x minus 3 and denominator x
4

Naomi wants to take yoga classes. She can take classes at the high school for a one-time fee of 20 dollars plus 10 dollars per class. She can join the local gym for 50 dollars and take classes for 5 dollars per class. Which statement is true about the average cost for the two options?

A
The gym option costs less per class for seven classes.
B
The high school option costs less per class for seven classes.
C
The gym option costs less per class for six classes.
D
The high school option costs less per class for six classes.
5

What is the correct form of the partial fraction decomposition for the fraction with numerator 35 minus 27 x and denominator 4 x squared plus 28 x ?

A
cap A over 4 x plus the fraction with numerator cap b and denominator x plus 7
B
the fraction with numerator cap A x plus cap b and denominator 4 x squared plus cap c over 28 x
C
the fraction with numerator cap A and denominator 4 x squared plus cap b over 28 x
D
the fraction with numerator cap A x plus cap b and denominator 4 x plus the fraction with numerator cap c and denominator x plus 7
6

For what values of A and m does f of x have a horizontal asymptote at y is equal to 2 and a vertical asymptote at x is equal to 1 ? f of x is equal to the fraction with numerator 2 x to the m th power and denominator x plus A

A
A is equal to negative 1 , m is equal to 0
B
A is equal to 1 , m is equal to 1
C
A is equal to 1 , m is equal to 0
D
A is equal to negative 1 , m is equal to 1
7

Which statement is true about the discontinuities of the function f of x ? f of x is equal to the fraction with numerator x squared minus 4 and denominator x cubed minus x squared minus 2 x

A
There is a hole at x is equal to 2 .
B
There are holes at x is equal to 0 and x is equal to negative 1 and an asymptote at x is equal to 2 .
C
There are asymptotes at x is equal to 0 and x is equal to negative 1 .
D
There are asymptotes at x is equal to 0 and x is equal to negative 1 and a hole at open paren 2 comma 2 thirds close paren .
8

Question text not available

Answer:

Insufficient information

9

What is the quotient? the fraction with numerator 3 y plus 2 and denominator 3 y divided by the fraction with numerator 6 y squared plus 4 y and denominator 3 y plus 2

A
1 over y
B
1 over 2 y
C
the fraction with numerator 2 times open paren 3 y plus 2 close paren and denominator 3
D
the fraction with numerator 3 y plus 2 and denominator 6 y squared
10

What is the product? the fraction with numerator 3 k and denominator k plus 1 times the fraction with numerator k squared minus 1 and denominator 3 k cubed

A
the fraction with numerator k minus 1 and denominator k squared
B
1 over k
C
negative 1 over k
D
the fraction with numerator k plus 1 and denominator k squared
13

Which solution to the equation the fraction with numerator 3 and denominator A plus 2 plus 2 over A is equal to the fraction with numerator 4 A minus 4 and denominator A squared minus 4 is extraneous?

A
A is equal to 4
B
neither A is equal to negative 2 nor A is equal to 4
C
A is equal to negative 2 and A is equal to 4
D
A is equal to negative 2
15

For the fraction with numerator 8 x to the 7th power plus 10 x to the 6th power plus 20 x to the 5th power plus 33 x to the 4th power plus 23 x cubed plus 37 x squared plus 9 x plus 4 and denominator open paren x plus 1 close paren squared times open paren x squared plus 1 close paren cubed , which expression represents the correct form of the partial fraction decomposition?

A
the fraction with numerator cap A and denominator x plus 1 plus the fraction with numerator cap b squared and denominator open paren x plus 1 close paren squared plus the fraction with numerator cap c cubed and denominator open paren x plus 1 close paren cubed plus the fraction with numerator cap d x plus cap e and denominator x squared plus 1 plus the fraction with numerator open paren cap f x plus cap g close paren squared and denominator open paren x squared plus 1 close paren squared
B
the fraction with numerator cap A and denominator x plus 1 plus the fraction with numerator cap b squared and denominator open paren x plus 1 close paren squared plus the fraction with numerator cap c x plus cap d and denominator x squared plus 1 plus the fraction with numerator open paren cap e x plus cap f close paren squared and denominator open paren x squared plus 1 close paren squared plus the fraction with numerator open paren cap g x plus cap h close paren cubed and denominator open paren x squared plus 1 close paren cubed
C
the fraction with numerator cap A and denominator x plus 1 plus the fraction with numerator cap b and denominator open paren x plus 1 close paren squared plus the fraction with numerator cap c and denominator open paren x plus 1 close paren cubed plus the fraction with numerator cap d x plus cap e and denominator x squared plus 1 plus the fraction with numerator cap f x plus cap g and denominator open paren x squared plus 1 close paren squared
D
the fraction with numerator cap A and denominator x plus 1 plus the fraction with numerator cap b and denominator open paren x plus 1 close paren squared plus the fraction with numerator cap c x plus cap d and denominator x squared plus 1 plus the fraction with numerator cap e x plus cap f and denominator open paren x squared plus 1 close paren squared plus the fraction with numerator cap g x plus cap h and denominator open paren x squared plus 1 close paren cubed
16

What are the vertical and horizontal asymptotes for the function f of x is equal to the fraction with numerator x squared plus x minus 6 and denominator x cubed minus 1 ?

A
vertical asymptote: x is equal to 1 horizontal asymptote: none
B
vertical asymptote: x is equal to negative 2 , x is equal to 3 horizontal asymptote: y is equal to 0
C
vertical asymptote: x is equal to negative 2 , x is equal to negative 3 horizontal asymptote: none
D
vertical asymptote: x is equal to 1 horizontal asymptote: y is equal to 0

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