Rate of change in word problems

Interpret slope as cost per item, speed, or growth per year, and build the equation from a story.

Standards:8.F.B.4F-IF.B.6

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 3

A water tank starts with 120 liters. It fills at 15 liters per minute. How many liters will be in the tank after 8 minutes?

Question 2 of 3

A tap fills a bathtub at a constant rate. After 3 minutes, the tub contains 12 liters of water. How many liters are in the tub after 8 minutes?

Question 3 of 3

A swimming pool drains at a constant rate. After 3 hours, 450 gallons have drained. How many gallons drain per hour?

How this fits in

Rate of change in word problems is one skill in the Linear Functions unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

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