What is the product of the 2 solutions of the equation 4x - 21 = 0?

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.

Find the values of the variables in the kite

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation. which method should jeremy use?