1. m + 13

• A number (m) increased by thirteen.

2.6x - 5

• Six and a number (x) decreased by five.

3. a + 9= 6

• A number (a) plus nine is equals to six.

4. 4n - 16 = 20

• Four a number (n) diminished by sixteen is twenty

5. p + 14 = 42

• A number (p) increased by fourteen is forty-two.