10 + 7 x 4 + 2 x 2 + 5 - 2
This problem is an order of operations problem
Parenthesis ( ) = work out anything in parentheses first
Exponents = Work out any exponents in the problem
Multiplication and Division can be worked starting from left to right, but you have to complete all operations involving both before you can move to addition
Addition and Subtraction can be worked starting from left to right as well
So the answer to: 10 + 7 x 4 + 2 x 2 + 5 -2
= 10 + 28 + 4 + 5 - 2
= 47 -2
= 45