I need help. I will give 100pts. Reese simplified this expression. What error did he make?

(10m^(3)n^(5))/(5mn^(2))=(10(mn)^(8 ))/(5(mn)^(2))=2(mn)^(6)

He did not make an error because 2(mn)6 is correct.

He did not divide by 5mn2.

He used a law of exponents on factors with different bases.

He should have divided the exponents for a final answer of 2(mn)4.

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?