## Algebra 1

$\frac{-240m^{3}}{r}$
Multiply the coefficients : $-240m^{2}r^{3}r^{-4}m$ This is equivalent to : $-240m^{2}mr^{3}r^{-4}$ This becomes : $-240m^{2+1}r^{3-4}$ ,since the exponents are added while bases are the same Final result : $-240m^{3}r^{-1}$ Now $r^{-1} = \frac{1}{r}$ Hence $-240m^{3}r^{-1} = \frac{-240m^{3}}{r}$