What is negative eight plus four

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

Bradley hikes 12 miles in 3 hours. in relation to bradley’s hike, which statement describes the expression

Which statement justifies why angle ebc measures 90?