7. Which of the following describes the parabola with the equation y = x2 + 2x + 1?

A. The axis of symmetry is x = 1 and the vertex is (1,4).
s

B. The axis of symmetry is x = 1 and the vertex is (1, 2).
rabolas
C. The axis of symmetry is x = 0 and the vertex is (0, 1).
as
D. The axis of symmetry is x = -1 and the vertex is (-1,0).
arabolas

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?