Answer:
1. two times a number
2. three added to a number
3. two times a number plus five
4. five times a number plus four times a number
5. a number divided by two
Explanation:
2a: "Twice the value of a"
x+3: "The sum of x and three"
2f+5: "Two times the value of f plus five"
5g+4h: "Five times the value of g plus four times the value of h"
n/2: "Half of the value of n"
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