Question

Jack has 9c sweets in a bag. He eats 2c sweets. a) Write a simplified expression to say how many sweets Jack has left. b) How many does he have left if c = 3?​

Answer 1

a) The simplified expression to represent the number of sweets Jack has left after eating 2c sweets is:
`\displaystyle 9c-2c`.

b) To find how many sweets Jack has left if
`\displaystyle c=3`, we substitute
`\displaystyle c=3` into the expression:
`\displaystyle 9(3)-2(3)=27-6=21`.

Therefore, if
`\displaystyle c=3`, Jack has 21 sweets left.

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Answer 2

Answers:

(a) 7c

(b) 21

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Step-by-step explanation:

Start with 9c and subtract off 2c to get 9c-2c = 7c.

We can think of it like 9 candies - 2 candies = 7 candies. Replace each "candies" with "c" so things are shortened.

Afterward, plug in c = 3 to find that 7c = 7*3 = 21