Martha estimated there were 99 marbles in a jar for a contest. the actual number of marbles in the jar was 121. what was the percent error of martha's estimation?

Which of the following would represent the sum of 3 consecutive integers if x is the first integer?

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

Asphere has a diameter of 10 in. what is the volume of the sphere?