1.[math]\frac{\left(2xy\right)^4}{\left(x^2y\right)^2}[/math]

2. [math]\frac{a^3b^2}{\left(-ab\right)^3}[/math]

3. [math]\frac{7xy}{3x}\cdot\frac{15x^2y}{21x^2y^3}[/math]

4. [math]\frac{x^3}{x^2-64}\div\frac{x^2}{x+8}[/math]

5. [math]\frac{6}{x^2-4}+\frac{2}{x-2}[/math]

6. [math]\frac{5x}{x^2-25}-\frac{2}{x-5}[/math]

7. Jane can type 75 pages in 8 hours. Ted can type the same number of pages in 13 hours. If Jane and Ted work together, how long will it take them to type 75 pages?[br]