PEMDAS
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
Use these in order to get the correct answer.
Use A: to find the value of x. In order to find that you would have to match one part of the proportion. x should be the numerator over 15 and 12 should be over 20 (The total length of that side of the triangle). Good luck. : )
