"A curtain manufacturer uses a 9090-yard roll of material to make 77 identical curtains. There was 7.757.75 yards of material left over. How many yards were needed for each curtain? "

I've been stuck on this question for a long time please someone help me :(

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.

Acircle has a circumference of 28.36 units what is the diameter of the circle

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.