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Need on this geometry question. explain how you did it.

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

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]