Find f(3a) of $\displaystyle f(x)= -2x^2 + 3x - 4$

and

The Solutions to $\displaystyle 6m^2 - 7m + 1 = 0

$

and

This is the equation used ot express the amount of items a business has at a given time. T = months.

$\displaystyle

N(t) = 5t^3 - 70t^2 + 245t

$

0<_ t <_ 10

Find when there are no items left..

PLEASE HELP!