Write the expression to match the words three times the sum of 8 and 4

Give all possible names for the line shown.calculation tip: lines can be written with either point first.

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.

The anwser cause i do not understand just plez