- Please help confused (2x^-2y^4)^2/(6x^-4y^-2)^-1 the answer is (24y^6)/x^8 my answer is (2y^6)/3x^8?

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How many elements are there in lanthanides? How much pounds of force does it take to launch a 51 pound object 12 feet into the air? What's causing the sudden increase in CFC-11? Identify X in the reaction below.
X + 1n → 142Ba + 91Kr + 3 1n? What is the probability of the arrow stopping on X on the first spin and F on the second?