Extra Set

Grade 8 · Unit 4 · L18 · Version A · DF25

Qualitative functional relationships

Name ________________

Date ________________

Period ________________

1.
A tank fills at a constant rate, then the valve shuts and the level stays constant. Describe the graph of volume vs. time.
Answer. A ray with positive slope, then a horizontal ray.
A ray with positive slope, then a horizontal ray.
2.
A car travels at a steady speed, then brakes to a stop. Speed vs. time?
Answer. A horizontal segment, then a decreasing segment to 0.
A horizontal segment, then a decreasing segment to 0.
3.
A car travels at a steady speed, then brakes to a stop. Speed vs. time?
Answer. A horizontal segment, then a decreasing segment to 0.
A horizontal segment, then a decreasing segment to 0.
4.
A tank fills at a constant rate, then the valve shuts and the level stays constant. Describe the graph of volume vs. time.
Answer. A ray with positive slope, then a horizontal ray.
A ray with positive slope, then a horizontal ray.
5.
A car travels at a steady speed, then brakes to a stop. Speed vs. time? Then Luis needs 5 of that amount. What is the total they need?
Answer. A horizontal segment, then a decreasing segment to 0.
A horizontal segment, then a decreasing segment to 0. Then multiply by 5: A horizontal segment, then a decreasing segment to 0..
6.
A car travels at a steady speed, then brakes to a stop. Speed vs. time? Then Nora needs 4 of that amount. What is the total they need?
Answer. A horizontal segment, then a decreasing segment to 0.
A horizontal segment, then a decreasing segment to 0. Then multiply by 4: A horizontal segment, then a decreasing segment to 0..
7.
A car travels at a steady speed, then brakes to a stop. Speed vs. time? Then Mei needs 5 of that amount. What is the total they need?
Answer. A horizontal segment, then a decreasing segment to 0.
A horizontal segment, then a decreasing segment to 0. Then multiply by 5: A horizontal segment, then a decreasing segment to 0..
8.
A car travels at a steady speed, then brakes to a stop. Speed vs. time? Then Luis needs 4 of that amount. What is the total they need?
Answer. A horizontal segment, then a decreasing segment to 0.
A horizontal segment, then a decreasing segment to 0. Then multiply by 4: A horizontal segment, then a decreasing segment to 0..
9.
A car travels at a steady speed, then brakes to a stop. Speed vs. time? Then Theo needs 4 of that amount. What is the total they need?
Answer. A horizontal segment, then a decreasing segment to 0.
A horizontal segment, then a decreasing segment to 0. Then multiply by 4: A horizontal segment, then a decreasing segment to 0..
10.
A car travels at a steady speed, then brakes to a stop. Speed vs. time? Then Malik needs 4 of that amount. What is the total they need?
Answer. A horizontal segment, then a decreasing segment to 0.
A horizontal segment, then a decreasing segment to 0. Then multiply by 4: A horizontal segment, then a decreasing segment to 0..
11.
Think
Grace tried this problem:
A car travels at a steady speed, then brakes to a stop. Speed vs. time?
Grace wrote A horizontal segment, then a decreasing segment to 1.. That is not correct. What is the right answer?
Answer. A horizontal segment, then a decreasing segment to 0.
Grace’s answer A horizontal segment, then a decreasing segment to 1. is off. A horizontal segment, then a decreasing segment to 0.
12.
Think
Nora tried this problem:
A tank fills at a constant rate, then the valve shuts and the level stays constant. Describe the graph of volume vs. time.
Nora wrote A ray with positive slope, then a horizontal ray. (check this). That is not correct. What is the right answer?
Answer. A ray with positive slope, then a horizontal ray.
Nora’s answer A ray with positive slope, then a horizontal ray. (check this) is off. A ray with positive slope, then a horizontal ray.

Original extra practice. Keys are computed from the items, not guessed.

L18 · Qualitative functional relationships