Simplify $\frac{70v}{710}$70v710.

Simplify $\frac{15k}{20k}$15k20k.

Express in simplest form:

$\frac{42xy}{18y}$42xy18y

Simplify $\frac{8k^2}{-12k}$8k2−12k

Factor polynomial expressions involving common factors, trinomials, and differences of squares, using a variety of tools and strategies