In a shipment of 20 computers, 3 are defective. tree computers are randomly selected and tested. what is the probability that all three are defective if the first and second ones are replaced after being tested ? ( 20 points )

Anyone know? is appreciated! will mark brainliest if correct!

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.

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?