The CHS baseball team is on the field and the batter popped the ball up. The equation is b(t)= 80t-16t^2+3.5 represents the height of the ball above the ground in a feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground ? Round to the nearest 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?