"B." Because you must do what's in the parenthesis first. So 6² is 36 so that would be x-36=9 then to solve it
0 = -16t^2 -60t +54
t = 0.75 seconds
solving by the quadratic equation or graphing calculator or completing the square.
It will take 20 days to make 20 craft pieces.
If she can make 5 in 5 days, then it will take her 20 days to make 20 craft peices