I've written the expressions and put the answer in the brackets next to them:
1) the sum of n and five [ n + 5 ]
2) five subtracted from n [ n - 5 ]
3) eight added to x [ x + 8 ]
4) eight subtracted from x [ x - 8 ]
5) eight minus x [ 8 - x ]
6) five minus n [ 5 - n ]
7) x added to the sum of five and seven [ (5 + 7) + x ]
8) the sum of eight and two, subtracted from x [ x - (8 + 2) ]
9) the difference of eight and two, added to x [ x + (8 - 2) ]
10) the sum of x and itself [ x + x ]
