Given sin 2/3 .find cos and tan

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?