For the differentiable function f the line tangent to the graph of f at x = 1 has equation y=4 - 2(x - 1), and the line tangent to the graph of f at x = 4 has equation
y = 3 - (x – 4). The differentiable function g is defined by g(x) = f-'(x) for all x.
What is the value of g'(4) ?

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?