John walks DR. He picks up a glass, looks at it and puts it down without drinking.
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Answer:
Step-by-step explanation:
In order to resolve correctly this combined calculation, we need to resolve it in order:
First, the operation in parenthesis. Secondly, the powers. Then multiplications and divisions, and after all, substraction and adittion.
So, we first resolve the parenthesis:
We multiply 12 by 2, and 3 by 1. The result is
Then we resolve the powers:
Thirdly, we resolve the multiplications:
= 72
And finally, the addition:
16 + 72 - 7 = 81
