Find the slope of the line

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

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?