HIGH SCHOOL LEVEL ONLY false answers will get reported 60 points ) An object is thrown in the air with initial
velocity of 48 ft/s from a height of 640 ft. The equation h(t) = -16t2+48t+640 models
the height of the object in feet after t
seconds. About how many seconds does it
take for the object to hit the ground?
Round your answer to the nearest tenth of
a second.

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?