The time (t) it takes for a group of volunteers to construct a house varies inversely as the number of hours (h). If 20 volunteers can build a house in 62.5 working hours, how many volunteers are needed to build a house in 50 working hours?
Select one:
A. 1250
B. 50
C. 125
D. 25

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.

X2 + y 2 = 36 x + y = 6 solve the system of equations.

Hi, can anyone show me how to do this problem? 100 points for this. in advance