what is the value of Evaluate 3b-2a-9 when a=12 and b=7.

Question

Evaluate 3b−2a−9 when a=12 and b=7.

 

The value is ?

 

How do I start to solve this?

Answer 1

evaluate 3b-2a-9 if a=12 and b=7

replace a with 12 and replace b with 7

3*7-2*12-9

use the order of operations

21-24-9

-3-9

-12   answer