Question

Peter is buying 4 calculators to donate to his class.

Each calculator costs $9. He is also buying a $1 bottle
of water for himself. He thinks his total will be $37.
Which expression could be used to estimate the
reasonableness of Peter's total?
4 × $1-$1
4 × $1 + $9
4 × $10-$9
4 × $10+ $1

Answer 1

Answer: 4 × $1 + $9

Step-by-step explanation: It is not saying he is buying a bottle for each calculator so you wouldn't have $10 in the equation so it can't be 4 × $10+ $1 / 4 × $10-$9 and there is no 9 in 4 × $1-$1 so that leaves you with 4 × $1 + $9 as the final answer.