. Using the t tables, software, or a calculator, estimate a) the critical value of t for a 90% confidence interval with b) the critical value of t for a 98% confidence interval with c) the P-value for with 4 degrees of freedom. d) the P-value for with 22 degrees of freedom.

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.