Answer:
your answer is 32
Explanation:
the order of operations is known as PEMDAS
P= parenthesis
E=exponents
M=multiplication
D=division
A= addition
S= subtraction
Step 1: identity
the first thing that you are going to do is go down the list see if there are any parenthesis, exponents, etc. n this case there's only multiplication, adding, and subtracting.
step 2: start solving
1. multiplication comes first in line so, you're going to do
3x7= 21
2. then Addition
21+15= 36
3. and lastly Subtraction
36-4= 32