Question

Write the sentences below as a mathematical expression.

1. the sum of a number and 9
2. 12 decreased by some number
3. some number decreased by 7
4. twice a number
5. 2 times a number
6. a number dived by 8
7. the quotient of a number and 3
8. double the sum of 8 and a number

Answer 1

1. a+9

2. 12-x

3. x-7

4. 2a

5. 2a

6. a:8

7. a/3

8. 2(8+a)