The domain for f(x) and g(x) is all real numbers. let f(x) = 3x^2 + x-7 and g(x) = x^2 + 4x-5

find (f-g)(x).

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Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax