Which is the intersection of the sets r={0, 1, 2, 4}, s={4, 9, 12, 13}, t={13, 15, 19, 20}?

a {4}
b null set
c {13}

Find the difference (8ab+a+2) - (3ab+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.

What is the output, or dependent variable of quantity? 1: x 2: f(x) 3: y