Respuesta :

If s is Riley's sister's age, their sum is s+(s+3), or 2s+3.
lyndalau86

Answer:

2s + 3

Step-by-step explanation:

If we name s Riley's sister's age, the problem tells us that Riley is 3 years older than her so his age would be s + 3

Thus, the sum of their ages would be:

Riley's age + Riley's sister's age

(s + 3) + s = s + 3 + s = 2s + 3

Thus, the expression would be 2s + 3

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