Hank the handy man charges a flat fee of $75 per visit, plus $45 per hour or fraction of an hour. mr. fixit's rate, in dollars, are shown in the function rule
(picture)
how much more does mr. fixit charge for his job lasting 5h and 15 mins than hank?
can you explain the answer , i really want to understand.

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?