Answer:
60
Explanation:
Use PEMDAS (parentheses, exponent, multiply, divide, addition, subtraction)
First, substitute 5 for x:
3(3(5) + 5)
Multipliy inside the parentheses:
3(15 + 5)
Add inside the parentheses:
3(20)
Multiply:
60
There's your answer! Hope I helped.