Unit Test — Unit test Answers

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21
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The table represents a bicycle rental cost in dollars as a function of time in hours.

Question illustration
A
This function represents a direct variation because it passes through the origin and has a constant rate of change of $5 per hour.
B
This function represents a direct variation because it has a positive, constant rate of change of $10 per hour.
C
This function does not represent a direct variation because it does not represent the cost for 1 hour.
D
This function does not represent a direct variation because the function rule for the cost is to add $10, not multiply by a constant.
22
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What phrases can be used to describe the line representing the relationship between the number of balloons remaining and the number of hats created? Select three options.

A
positive slope
B
negative slope
C
constant slope
D
increasing function
E
decreasing function
23

The graph represents revenue in dollars as a function of greeting cards sold.

Question illustration
A
y = x
Option A
B
y = x
Option B
C
y = 2x
D
y = 4x
24

The points (3, 24) and (7, 56) represent points of a function where y, the number of photographs, varies directly with x, the number of pages in an album. Which statement describes another point on the graph of this function?

A
A 50-page photo album holds 400 photographs.
B
An 80-page photo album holds 560 photographs.
C
A 100-page photo album holds 8,000 photographs.
D
A 900-page photo album holds 8,400 photographs.
25

Chin was shown the graph of a line that contained point (1, 7). He wrote f(x) = 4x + 3 to correctly represent the line. Which of these equations could represent the same line?

A
y – 7 = 3(x – 1)
B
y – 1 = 3(x – 7)
C
y – 7 = 4(x – 1)
D
y – 1 = 4(x – 7)

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