Pennsylvania Keystone Test

Question 1

Which of the following sets of ordered pairs represents a function?

{(-2, 2), (-1, 5), (0, 8), (1, 5), (2, 2)} {(3, 4), (5, -1), (3, 7), (8, 0)} {(1, 1), (2, 2), (1, -1), (2, -2)} {(-4, 9), (-4, 3), (0, 0), (4, 3)}

Correct Answer:

{(-2, 2), (-1, 5), (0, 8), (1, 5), (2, 2)}

Question 2

A plumber charges a flat fee of $50 for a service call, plus an additional $75 per hour of labor. This relationship is modeled by the function C(h) = 75h + 50, where C(h) is the total cost and h is the number of hours of labor. What do the slope and y-intercept represent in this context?

The slope is the flat fee, and the y-intercept is the hourly rate. The slope is the number of hours, and the y-intercept is the total cost. The slope is the hourly rate, and the y-intercept is the flat fee. The slope is the total cost, and the y-intercept is the number of hours.

Correct Answer:

The slope is the hourly rate, and the y-intercept is the flat fee.

Question 3

The table below shows some values for a function, f(x). Which of the following statements best describes this function? | x | f(x) | |---|---| | -2| 4 | | -1| 1 | | 0 | 0 | | 1 | 1 | | 2 | 4 |

It is a linear function because the x-values increase at a constant rate. It is not a function because the f(x) values of 1 and 4 are repeated. It is a nonlinear function because the rate of change is not constant. It is a linear function because it passes the vertical line test.

Correct Answer:

It is a nonlinear function because the rate of change is not constant.

Question 5

A researcher is tracking the population of a certain species of bird. The population started at 80 and has been decreasing by 6 birds each year. Which function, P(t), correctly models the bird population after t years?

P(t) = 80t - 6 P(t) = 6t - 80 P(t) = 80 + 6t P(t) = 80 - 6t

Correct Answer:

P(t) = 80 - 6t

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About this Exam

Prepare with the Pennsylvania Keystone Test practice quiz. This question bank includes 50 questions covering function, principle, represents, number, and labor. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Pennsylvania Keystone Test

This practice set contains 50 questions from the matching question bank and focuses on function, principle, represents, number, and labor. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Pennsylvania Keystone Test

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