Describe the end behavior of the graph of the function. hx()=−3x4+4x3+10x2−8x+7
a. hx()→−∞as x→−∞and hx()→−∞as x→∞
b. hx()→−∞as x→−∞and hx()→∞as x→∞
c. hx()→∞as x→−∞and hx()→−∞as x→∞
d. hx()→∞as x→−∞and hx()→∞as x→∞

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?