ItzCubez

$\big(\frac{2}{3}*\frac{2}{3}\big) + 6.25$

$\frac{4}{9}+6.25$

$\frac{4}{9}+6\frac{1}{4}$

$\frac{16}{36}+6\frac{9}{36}$

$6\frac{25}{36}$

$-3+(-2)$

$=\boxed{-5}$

Inequalities:Example 1:      Latex code: x+1 \geqslant 0

                   Example 2:      Latex code: x-1 \leqslant 0

Instead of \geqslant and \leqslant you can use

$x+1\geq0$Latex code: x+1\geq0

$x-1\leq0$Latex code: x-1\leq0

That is a very good point. The equation is not "unsolvable" (I just did it) but there is $\boxed{\text{No Solution}}$

c=-25

$13=-\frac{x}{2}$

$26=-x$

$x=-26$

Density (p) = $\frac{Mass (m)}{Volume (V)}$

Can you take it from here?