$\frac{dx}{dt}=\frac{2.5-2x}{4+t}$
$3x+25,25>2x+30,45$
$\ln\:\left(x^3-2x+1\right)-2\ln\:\left(3x-1\right)$
$-9x^2-15x+3$
$\int\frac{1}{\sqrt{64+x^2}}dx$
$2y^2-6y+5+15$
$\left(-1\right)^3-2\left(-1\right)^2+\left(-1\right)-9$
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