A cyclist is riding from the city to the country. She rides 20 miles each hour. At the
beginning of the 1st hour, she is 10 miles
away from the city center. At the beginning of
the 2nd hour, she is 30 miles away from the
city center. Write an explicit formula to show
her distance from the city at any given hour.
Then use the formula to find her distance at
the beginning of the 5th hour.

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?