91Ó°ÊÓ

In the following exercises, simplify the expression.

$\left(-9r^4{s}^5\right)\left(4r{s}^7\right)$

In the following exercises, simplify the expression.

$3k\left(k^2-7k+13\right)$

A girl drops a ball off a cliff into the ocean. The polynomial $−16t^2+250$gives the height of a ball t seconds after it is dropped from a 250-foot tall cliff. Find the height after$t=2$ seconds.

In the following exercises, simplify the expression.

$\left(m+6\right)\left(m+12\right)$

In the following exercises, simplify the expression.

$\left(v-9\right)\left(9v-5\right)$

In the following exercises, simplify the expression.

$\left(4c-11\right)\left(3c-8\right)$

In the following exercises, simplify the expression.

$\left(n-6\right)\left(n^2-5n+4\right)$

In the following exercises, simplify the expression.

$\left(2x-15y\right)\left(5x+7y\right)$

In the following exercises, simplify the expression.

$\left(7p-5\right)\left(7p+5\right)$

In the following exercises, simplify the expression.

${\left(9v-2\right)}^2$