$\frac{da}{dt}=6-\frac{3}{400}a$

$\lim_{x\to\infty}\left(\frac{7x^2-5}{x^2-16}\right)$

$3-8\cdot8+10$

$\int r\cdot ln\left(r\right)dr$

$5x+5<3x+11$

$-\left[\left(-16\right)-\left(-5\right)\right]-\left\{-\left(-18\right)-\left(-8\right)-\left[\left(-19\right)-\left(-9\right)\right]-\left(-2\right)\right\}$

$\int_1^4\left(\frac{4x}{\left(3x-2\right)^2}\right)dx$