Use an expression to solve a real situation
The story gives a rule written with a letter. Put the number from the last sentence in place of the letter.
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A library has 12 books and buys 4 more each month. After m months it has 12 + 4m books. How many books does it have after 3 months?
Answer: 24
A water bottle holds 25 mL and a runner drinks 4 mL each km. After d km the bottle holds 25 − 4d mL. How much is left after 2 km?
Answer: 17
A tree is 10 cm tall and grows 3 cm each year. After y years its height is 10 + 3y cm. How tall is it after 1 years?
Answer: 13
Tip: The story gives a rule written with a letter. Put the number from the last sentence in place of the letter.
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