The temperature was –5°C at 6:00 a. m. It increased 3/4 of a degree every hour for 6 hours. The temperature then increased 1 1/2 degrees every hour for 5 hours. What was the temperature at 5:00 p. m.?

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?