Perform the following operation and express in simplest form.
x−9/x^3 ÷ x^2-81/x^2+8x-9

In the surface area formula for cylinders which expressionrepresents the lateral area

1. are the corresponding angles congruent 2. find the ratios of the corresponding sides 3. is triangle jkl congruent to triangle rst? if so what is the scale factor

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?