When maras math project was graded, her teacher gave her 40 points for showing all of her calculations. She
then deducted 15 points for not following
instructions, gave 20 points for a parent
signature, and reduced her final grade by
30 points for being late. Which
expression would help Mara calculate the
final grade on her project?
A. (-20) + (-40)+ 15 + 30
B. 20 + 40 + 15 + 30
C. 40 + (-20) + (-30) + 15
D. 40 + (-15) + 20 + (-30)

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

Simplify. 4+3/7x-2-2/7x a. 2-5/7x b. 6-1/7x c. 2+1/7x d. 6+5/7x

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?