There is one error in one of five blocks of a program. to find the error, we test three randomly selected blocks. let x be the number of errors in these three blocks. compute e(x) and var(x).

A80-foot piece of siding is cut into three pieces so that the second piece is four times four times as long as the first piece and the third piece is five times as long as the first piece. if x represents the length of the first piece, find the lengths of all three pieces.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer