Eddie found a store that sells cell phone cases for $18.50

Last updated: 7/19/2022

Eddie found a store that sells cell phone cases for $18.50 plus $0.15 per letter engraved on the case. A second store sells cases for $18.00 plus $0.25 per letter engraved on the case. How many letters would Eddie have to engrave on his case for it to cost the same at either store? 5 letters 50 letters 7 letters 10 letters