Hot dogs cost $2.50 and drinks cost $1.75 at the ball park. Bobby only purchased hot dogs and drinks and had a total
of 9 items for $19.50. How many hot dogs did Bobby buy?

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.