What is the value of x ?

Which statement describes the term economics? a. it is the study of using limited resources to fulfill wants and needs. b. it is the study of how governments fulfill the wants and needs of nations. c. it is the study of how people spend their money to fulfill wants and needs.

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled