Can you provide a picture?
The answer to this question is 25,686
TO get the decimal 8 is obviously 8.0 and for 21/40 just divide 40 for both the numerator and denominator. Then add the 8.0 with the answer you get for 40 together to get the final answer.
This is the equations of a parabola
y = 3x^2 - 4x - 1 graphed is a parabolic arc
