Fred keeps his savings in his mattress. He began with $1000 from his mother and adds $250 each year. His total savings y after x years are given by the equation y = 1000 + 250x Draw a graph of this equation. (Choose two values of x, such as 0 and 10. Compute the corresponding values of y from the equation. Plot these two points on graph paper and draw a straight line joining them.) After 20 years, how much will Fred have in his mattress? (Give your answer as an exact number.) Fred's savings: $