The amount of sand that a cement mixer requires for a batch of cement varies directly with the amount of water required. The cement mixer uses 200 gallons of water for 320 pounds of sand How many pounds of sand are needed for a batch of cement that will use 250 gallons of water?

33% of college students say they use credit cards because of the rewards program. you randomly select 10 college students and ask each to name the reason he or she uses credit cards. find the probability that the number of college students who say they use credit cards because of the rewards program is (a) exactly two, (b) more than two, and (c) between two and five inclusive. if convenient, use technology to find the probabilities.

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Which graph represents the equation y =4x