A bag of marbles contains 7 blue, 3 red, 11 yellow, and a green marbles.
What is the probability that Beth
randomly draws out a green marble
followed by a purple marble if she
doesn't put back the first marble?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons