Translate each sentence into an equation.
1. the sum of twice (r) and three times (s) is identical to thirteen.
2.the quotient of (t) and forty is the same as twelve minus half of (s).
3. two hundred minus three times a number is equal to nine.
4. the sum of one - third a number and 25 is as much as twice the number.
5. the square of (m) minus the cube of (n) is sixteen.
6. two times (z) is equal to two times the sum of (v) and (z).