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7th Unit 5 Section C Checkpoint

Question 1

Multiple choice

Solve for a:

a + 6.5 = -3.2

  • a = 9.7

  • a = -9.7

  • a = 3.3

  • a = -3.3

Question 2

Multiple choice

Solve for b:

-4b = 30

  • b = -120

  • b = 120

  • b = -7.5

  • b = 7.5

Question 3

Multiple choice

An elevator is descending at a rate of 2.5 feet per second. How long will it take the elevator to go down 20 feet?

Choose the equation that best represents the situation:

  • 20 - x = 2.5

  • x + 2.5 = -20

  • 20 ➗ -2.5 = x

  • -2.5x = -20

Question 4

Short answer

A scientist is using a drone to explore a cave. Over a period of 6 seconds, the drone goes from 25 feet below the surface to 16 feet below the surface.


How fast is the drone moving upward? Explain your reasoning.

At this rate, when will the drone be 5 feet above the ground? Explain your reasoning.

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