Question

Determine if the situation described in each row can be represented by 9x+3=21 or by 3x+9=21. Select the correct answer in each row. Situation 9x+3=21 3x+9=21 Selina had 21 stickers. She gave the same amount of stickers to each of her 9 friends and had 3 stickers left over. How many stickers did Selina give each friend? Robert went to an art supply store. He got a pack of paintbrushes for $9 and some bottles of paint for $3 each. His total came out to $21, before tax. How many bottles of paint did Robert get? Louise needs to paint 21 ceramic vases. She has already painted 9 vases and can paint 3 vases in one hour. How many hours will it take Louise to paint the remaining ceramic vases? Mario had a 21-inch piece of ribbon. He cut 3 inches off and then cut the remainder of the ribbon into 9 equal pieces. What is the length of each of the nine pieces of ribbon?

Answer 1

Selina gave 2 stickers to each of her friends.

Robert bought 4 bottles of paint.

What is a numerical expression?

A numerical expression is a mathematical statement written in the form of numbers and unknown variables. We can form numerical expressions from statements.

Given, Selina had 21 stickers. She gave the same amount of stickers to each of her 9 friends and had 3 stickers left over.

This can be represented as,

9x + 3 = 21.

9x = 18.

x = 2.

So, she gave 2 stickers to each of her friends.

Robert went to an art supply store.

He got a pack of paintbrushes for $9 and some bottles of paint for $3 each.

His total came out to $21, before tax.

3x + 9 = 21.

3x = 12.

x = 4.

Robert bought 4 bottles of paint.

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