The mean of the data set is 15. what number is missing of these data set: 18, 16, - 9, 12, 23

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Shane can shovel the driveway in 4 hours, but if his sister it would take 2 hours. how long would it take taylor to shovel the driveway alone

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.