3 to the power of 15 is how many times larger than 3 to the power of 12

Aiden buys two bags of chips at $1.09 each and a 20 ounce soda for $1.20 at the gas station.he knows that the state tax is 5.5. how much change will he receive from a $5 bill?

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14