To find the original cost of the groceries (n), we start with the information given:
- Nick bought groceries for \( n \) dollars.
- He had a coupon for $15.50 off.
- After using the coupon, he paid $34.63.
The equation representing this situation would be:
\[ n - 15.50 = 34.63 \]
This means that the original cost of the groceries (n) minus the coupon discount of $15.50 equals the amount he paid ($34.63).
Now, let's solve for n:
\[ n = 34.63 + 15.50 \] \[ n = 50.13 \]
So the correct equation is \( n - 15.50 = 34.63 \) and the original cost of the groceries Nick bought was $50.13.
Therefore, the correct response is:
n − 15.50 = 34.63; the original cost of the groceries Nick bought was $50.13.