Find the area of a circle with a diameter of 6

What is the simplified expression for 6(2(y+x))

Which of these choices show a pair of equivalent expressions?

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.