Please help :(( Which of the following is the mark of a math novice as compared with a math expert?

A). Tackling a complex problem step-by-step rather than all at once
B). Identifying which mathematical principles are involved in solving a problem
C). Waiting until a multipart problem is completed to check all the calculations memorizing the solution to each problem given a lesson

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?