The sum of three numbers is 11. The third is twice the second. The sum of the first two is one less than the third. Write equations to model this situation and solve it to find the
numbers.

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a seven or king. (b) compute the probability of randomly selecting a seven or king or jack. (c) compute the probability of randomly selecting a queen or spade.

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

What is the surface area of the sphere?