2/5
$\pi$ 8
$\sqrt{Box}$ 289
9/2 as a percent
$\sqrt{\Box}$ 5
(t+4)(t+5)
(t-1)(t-2)(t+5)(t-8)=-360
$$\prod_{n=1}^{13}\left(1-\frac{4}{(2n-1)^2}\right)=?$$
$$\prod_{n=1}^{25}\left(1-\frac{4}{n^2}\right)=?$$
CALCULATE
x+3 % $x^{2}$-9
