Final answer:
To add the fractions (2)/(a+3) and (4)/(a+3), simply add the numerators to get (6)/(a+3), because they have the same denominator.
Step-by-step explanation:
The question involves the addition of two fractions with the same denominator, which is a basic concept in algebra. Since both fractions (2)/(a+3) and (4)/(a+3) share the same denominator, they can be added together directly by adding their numerators. Hence, the sum of the two fractions is (2 + 4)/(a+3).
This simplifies to (6)/(a+3). This is because, in fraction addition, when the denominators are equal, you only need to perform the addition operation on the numerators, keeping the denominator the same. This principle is similar to adding whole numbers—where the order of addition does not affect the result, known as the commutative property (A+B=B+A).