Agroup of friends went to lunch. the bill before sales tax and tip was $37.50. a sales tax of 8% was added. the group then tips 18% of the amount after the sales tax was added. what was the amount in dollars of the sales tax?

in mathematics, a function is a relationship between two variables such that the value of one of the variables, called the dependent variable, is determined by the value of the other variable, called the independent variable. there is a specific term we use to describe the set of independent variables of a function.