translate the following English or verbal phases into mathematical phrases or vice versa

Answer:
3. AB² (?)
4. Five times the sum of x and y totals fifteen
5. Y minus the quantity of total of thirteen and some number
6. 30 (X + Y)
[tex]7. \: \: 20 + \frac{x}{4} [/tex]
8. B + A
9. Ten times the sum of N and M totals twenty
[tex]10. \: \frac{10x}{6} [/tex]