Two of your friends are attending a college that you are considering. One friend is taking 10 credit hours and paying $3,800 in tuition and fees for the semester. Another friend is taking 20 credit hours and paying $6,850 in tuition and fees for the semester. Find a function to model the total cost for the semester, T, of taking h credit hours. Use it to determine how much you will pay if you take 18 credit hours.