The Math Club bought 16 graphing calculators for $765. The TI-70 model costs $40 and the TT-83 costs $65. How many TI-83 calculators were purchased?

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.

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?