A company charting its profits notices that the relationship between the number of units sold, x, and the profit, P, is linear. If 150 units sold results in $1200 profit and 200 units sold results in $4100 profit, write the profit function for this company.
P =

Find the marginal profit.
$

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?