Juanita wants to participate in a 20-kilometer bicycle race. she is considering using one of the two training programs below. program a: ride 10 kilometer on the first day and increase the distance by an additional 500 meters each day. program b: ride 7,500 kilometers on the first day and increased distance by an additional 0.75 kilometer each day. if juanita chooses program a, on which day will she ride 15 kilometers for the first time?

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?