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numious
9.6*10^21 is your answer
You multiply 2.4 with 4 to get 9.6. Then 10^14 times 10^7 and you should get 10^21. Since the number 9.6 is between 1 and 10, you don't do anything with the exponent. So the scientific notation would be 9.6 x 10^21. :)