What is the explicit formula of the sequence?

What is the answer to |-2x-5|-|-4+8| and x=7

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan 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?

What is coefficient of the term of degree of degree 5 in the polynomial below