Answer:
.
Explanation:
We re asked to write an algebraic expression for the given word phrase.
The sum of 'a' and 'b' would be 'a' added to 'b' as:
.
2 times the sum of 'a' and 'b' would be 2 multiplied to the sum of 'a' and 'b':
.
Therefore, our required expression would be
.