Which is equivalent to RootIndex 3 StartRoot 8 EndRoot Superscript x?

RootIndex x StartRoot 8 EndRoot Superscript x
8 Superscript StartFraction 3 Over x EndFraction
8 Superscript StartFraction x Over 3 EndFraction
8 Superscript 3 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?