If f(x) = x^3, which of the following describes the graph of f(x + 2)?
a.) the graph of f(x + 2) is a horizontal shift of f(x) = x^3 two units to the left.
b.) the graph of f(x + 2) is a vertical shift of f(x) = x^3 two units up.
c.) the graph of f(x + 2) is a horizontal shift of f(x) = x^3 two units to the right.
d.) the graph of f(x + 2) is a vertical shift of f(x) = x^3 two units down.

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?