translate the following into mathematical phrases

Answer:
26). n+13
27). 2 × n- 34
28). 1/2n - 14
29). 1/3n + 18
30). 2 (20/ n+5)
Step-by-step explanation:
-When you add up 13 numbers, you get a number that equals 13 + N (N is the so-called "a Number").
-Thirty-four less than twice a number. You must first double the number by two, then subtract 34 from it.
-Half of the number decreased by 14. first is the half of N (the number) then you decrease it with 14.
-One-third of a number added to 18. It's the same as the third, but it's now a 1/3, and it's an addition, so you'll need to subtract 1/3 of the Number and then add it to 18.
-Twice the quotient of 20 and the sum of a number and 5, You must first add N and 5, then divide 20 by n+5, and then multiply by two.