Johnny was able to drive an average of 33 miles per hour faster in his car after the traffic cleared. He drove 19 miles in traffic before it cleared and then drove another
104 miles. If the total trip took 3 hours, then what was his average speed in traffic?

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?