To find the number of balloons Alexa popped, we can set up the equation based on the information given:
Krista popped 5 balloons, and together they popped a total of 13 balloons. Therefore, the relationship can be represented by the equation:
\[ n + 5 = 13 \]
Where \( n \) is the number of balloons Alexa popped.
To solve for \( n \):
\[ n + 5 = 13 \] \[ n = 13 - 5 \] \[ n = 8 \]
So, Alexa popped 8 balloons.
The correct response is:
n + 5 = 13; Alexa popped 8 balloons.