The sum of a number x and 4 equals 12

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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?

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2