4/(1+3) or

Addition is the first step for two reasons.
1) the Order of Operations requires you do operations in parentheses first
2) the division cannot be performed until you know what you're dividing
Answer:
35+28=63
Step-by-step explanation:
hope this helps
There's nothing to substitute, and no solution,
until somebody gives you another equation.
Volume equals pi times r squared times height
So it would be 81pi in cubed