$\pi r^{2}$
$x^{2} + 4 x + 4 = 0$
$x = \frac{- b ± \\sqrt{b^{2} - 4 a c}}{2 a}$
$A = \begin{bmatrix} x & y \\ z & w \end{bmatrix}$
$∫_{1}^{t} \frac{ⅆ x}{x}$
$a x^{2} + b x + c = 0$
$2 x × - \frac{1}{16} + \left(− 5\right)^{2} = 24 \frac{15}{16}$
$E = m c^{2}$
$\left(a + b\right)$
$8.44 x + 55 y = 0 \\ 3.1 x - 0.7 y = - 1.1$
$\sin \left(x\right) + 5$
$\overline{x + y}$