Suppose that income is a function of age. The following function represents the relation between average annual income I and age a.
I(a)=-54a^2 +5119a-54,421
(a) For what age does average income I equal $40,000?
(b) For what age does average income I equal $50,000?

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.