These data tables show sales of the Earn a Million-a-Day At Home video. Read the table, and then examine the graphs below.
Week
1
2
3
4
15
Sales
252
246
265
276
|280
Graph A
330
310
Sales
290
270
250
0
1
5
2 3 4
Week
Graph B

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?