Simplify 4 to the power of 9 times 4 to the power of 3 (with steps on how to do it please and the answer)

What could explain what happened when the time was equal to 120 minutes

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

What’s the answer ? use the picture to see the problem