Given P(A) = 0.4. PfB) =0.5 and P(A and B )= 0.3
Find (a) P(A) =
(b) P ( A or 3 ) =

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?