If m∠E=9x-36 and m∠F= 2x+40, find m∠F (supplementary)

The graph below shows the amount of money left in the school’s desk fund, f, after d desks have been purchased. for each new desk that is purchased, by how much does the amount of money left in the school’s desk fund decrease?

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

Three coins are flipped. what is the probability that there will be at least two tails?