Which is the correct algebraic expression after combining like terms? 6 c d + 3 c minus 7 d minus 3 c d + 4 d + one-third c 3 c d + 2 and two-thirds c minus 11 d 3 c d + 3 and one-thirds c minus 3 d 9 c d + 2 and two-thirds c minus 3 d 9 c d + 3 and one-thirds c minus 3 d

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?