Use the Associative Property of Addition to write an expression equivalent to (x + 7) + 2 . Which expression is equivalent to (x + 7) + 2 by the Associative Property of Addition?

A. 2 + (x + 7)
B. x + 7 + 2
C. x + (7 + 2)
D. (x + 2) + 7 ​

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?