The height, h m, of a golf ball at time, t s , from the ground is given by
h = -5t- + 15t.
(a) Draw the graph of h = -5t- + 15t for
0 (b) Find the maximum height of the golf ball
from the ground.
(c) Find the time of flight of the golf ball.
(d) When is the golf ball 8 m above the
ground?

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?