A company manufactures printers. The equation -0.0002x2 +0.0563.2 – 0.169 = 4 can be solved to find the price
per printer that the company will need to charge to make an annual profit of
approximately 4 million dollars ($4,000,000).
The graphs of y = -0.0002x² + 0.05632 – 0.169 and y = 4 are shown.
What does the graph tell you about the price the company should charge?

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?