Ramón is graphing the function f(x)=3(4)x he begins by plotting the initial value which graph represents his initial step

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 the definition of exponential decay?

Can someone me and do the problem plz so i can understand it more better