What expression is equivalent to 4 to the 4th power x 4 to the -9th power? answers to choose from: 4 to the 13th power 4 to the 5th power 1/4 to the 13th power 1/4 to the 5th power note: it is not the whole equation to the 13th and 5th powers in the last two answer choices, just the denominator