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 peters total

Step-by-step explanation:

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.

The equation representing the scenario will be :

=

= 37 dollars

The equation is :

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8