Lesson 1: Does This Predict That? — Practice Questions

1. 1. A car's speed is 40 mph at 2:00 PM and 55 mph at 2:10 PM. In this 10-minute period, the speed increased by ___ mph.

2. 2. A pool's water level is 3 feet at 1:00 PM and 7 feet at 3:00 PM. The water level increased by ___ feet during this time.

3. 3. A company's quarterly revenue was: Q1, $200k; Q2, $250k; Q3, $300k; Q4, $350k. What trend does this data show?

   • A. Revenue increased at a constant rate.
   • B. Revenue increased at an accelerating rate.
   • C. Revenue decreased over the year.
   • D. Revenue was unchanged.

4. 4. From 10 to 20 seconds, a rocket's altitude changed from 50m to 120m. From 20 to 30 seconds, it changed from 120m to 210m. The altitude gain in the second interval was ___ meters.

5. 5. A student's test scores are recorded: Test 1, 75; Test 2, 85; Test 3, 90; Test 4, 92. What trend does this show about their improvement?

   • A. The improvement per test is slowing down.
   • B. The improvement per test is speeding up.
   • C. The scores are improving at a constant rate.
   • D. The scores are decreasing.

6. 6. The temperature of a freezer is -5 degrees at noon. By 1 PM, it is -12 degrees. The temperature dropped by ___ degrees in that hour.

7. 7. A biologist tracks a plant's height. Data: Day 1, 4 cm; Day 2, 7 cm; Day 3, 13 cm; Day 4, 25 cm. What trend does this data show?

   • A. The plant's growth is accelerating.
   • B. The plant's growth is constant.
   • C. The plant's height is decreasing.
   • D. The plant has stopped growing.

8. 8. The table shows the number of hours a student practices piano ($x$) and their score on a music quiz ($y$). What was the score for a student who practiced for 2 hours? | Hours ($x$) | Score ($y$) | | :---: | :---: | | 1 | 82 | | 2 | 89 | | 3 | 94 | Score: ___

9. 9. A gym owner tracks the number of hours a member exercises per week and the number of calories they burn. For one member, the data pair is (5, 2500). What does the number 5 represent?

   • A. The number of hours exercised
   • B. The number of calories burned
   • C. The member's identification number
   • D. The total number of members

10. 10. A cafe owner recorded the price of a latte and the number sold in a day. If 120 lattes were sold when the price was 4 dollars, what is the $y$-value for this data pair $(x, y)$, where $x$ is the price? $y$ = ___