Identify the property being demonstrated for each expression. 3 + (5 + 7) = (3 + 5) + 7

(3)[5(7)] = (3)[7(5)]

5 + 0 = 5

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

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.

Bring the fraction a/a-4 to a denominator of 16-a^2