Question

Help please on this photo below

Answer 1

12- n/12 (n divided by 12, n is your unknown number)
13- n + 6
14- 9(n-5) this is nine times n-5, n-5 HAS to be in parentheses!
15- (4 * N) -1

Answer 2

12. The quotient of a number and ten = n/6

13. The sum of a number and six = x + 6

14. The product of nine and five less than a number = n = 9*5

15. Four times a number, reduced by one = 4*n - 1

I may have some wrong answers so please check them. :l