Which operation should be performed first according to the order of operations?

44 : 2 + 9 - [120 - (5 + 10 • 7) ]

A.

44 : 2

B.

2 + 9

C.

5 + 20

D.

10 • 7

The answer is D because you have to sneer what is in the parentheses first

Always parenthesis first. So now we have (120 - (5+10x7))

In the parenthesis, again the parenthesis goes first

SO we have (5+10 x 7)

Now multiplication goes first

10 times 7

So the very first thing you should do in this question is to multiply 10 by 7