Robert is completing construction of a square inscribed in a circle, as shown below. what should be the next step in his construction?
a. construct a perpendicular bisector to line ab
b. place his compass on the radius and draw two arcs above and below line ab
c. make another circle from point b with the same radius as his original circle
d. draw a line parallel to line ab and that touches the circle at point a

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

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?