Mary and David can do a job alone for 10 days and 15 days respectively. At first 4 days alone then David went to work alone for 5 days. Maria completed the work in 4 days. If Mary, David, Maria would finish the work together in three days.

Restrictions on f(x) = 1/x+5 and g(x) = x-2

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?

Write an equation of the line that passes through the point (2, 3) and is perpendicular to the line x = -1. a) y = 1 b) y = 3 c) y = 0 eliminate d) y = -3