Renting a car costs $30 per day, or $600 per month. Renting daily is cheaper for a few days, but after how many days are the two options equal (after which renting monthly is cheaper)?

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?