Question: Identify the independent variable for each relation. Is the relation a function? a. the price of a graphing calculator and the sales tax you pay

Identify the independent variable for each relation. Is the relation a function?
a. the price of a graphing calculator and the sales tax you pay
b. the amount of money in your savings account and the time it has been in the account
c. the amount your hair has grown since the time of your last haircut
d. the amount of gasoline in your car's fuel tank and how far you have driven since your last fill-up

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