Which scenario is modeled in the diagram below? Percents Total 80% 20% 100% 20% 20% 20% 20% $6.87 Dimitri used a coupon that saved him 80 percent, or $6.87. He paid $34.35 for the items. Dimitri used a coupon that saved him 80 percent, or $27.48. He paid $34.35 for the items. Dimitri used a coupon that saved him 80 percent, or $6.87. The price of the items before the discount was $34.35. Dimitri used a coupon that saved him 80 percent, or $27.48. The price of the items before the discount was $34.35.

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

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?