Which is the same as multiplying a number by two? a. subtracting a number from itself b. adding 2 to a number c. adding a number to itself d. multiply a number by itself

(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

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what grade level is this? need to know so i can look in my old textbooks!