Do these functions have the same concavity? F(x)=-3x^2+12x-32

Two numbers have a sum of -19. one number is x. what expression represents the other number?

For the chance to be team captain, the numbers 1-30 are put in a hat and you get two chances to pick a number, without replacement. which formula correctly shows how to find the probability that you choose the number 1 and then 2?

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs