1 You are running a fuel economy study. One of the cars you find is blue. It can travel 40, miles on
1
4
4
1, gallons of gasoline. Another car is red. It can travel 28 miles on
5
gallon of gasoline. What is
5
the unit rate for miles per gallon for each car? Which car could travel the greater distance on
1 gallon of gasoline?

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?