Which of the following is a polynomial with roots 4, −5, and 7? question 4 options: 1) f(x) = x3 − 6x2 − 27x + 140 2) f(x) = x3 − 6x2 − 20x + 27 3) f(x) = x3 − 20x2 − 27x + 35 4) f(x) = x3 − 20x2 − 35x + 140

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?