Ms. Johnson uses a statistics program to analyze all the data collected by her students during a lab experiment about acceleration due to gravity. The program reports =31.5 and . What is the variance of the data? Round to the nearest tenth.

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.

Can someone me and do the problem plz so i can understand it more better

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?