Earth radius is 6.4x10^6m and earth surface is 70%water and the ocean depth of 3795m what is the volume of water on earth

Two lines parallel to the same plane are parallel to eachother

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.

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees