In a random sample of 15 mortgage institutions , the mean interest rate was 3.57% and the sample standard deviation was 0.36%. a) construct a 95% confidence interval using the Z or t Interval

b) state which interval was used - Z or T Interval ​

Graph the system: f(x)= 3/x-2; f(x)= 1/2x + 2

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.

What is always true about a positive integer raised to a negative odd power?