P(a) = .50, p(b) = .30,and p(a and b ) = .15 what is p(a and b)?
a. 0.18
b. 0.65
c. 0.20
d.0.80

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

Select the number of ways in which a line and a circle can intersect

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?