Please help me on number 4.

6.3x+14 and 1.5x-6 answer in simplified form

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?