How do you simplify 20 - 2(4x -3)

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

2.5 milligrams is equivalent to how many grams

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?