Which shows the expression below simplified?

(2.2 x 10^-1) + (2.3 x 10^-2)

Hint: You must have the same power of 10 before you can add.

A) 2.43 x 10^-2

B) 4.5 x 10^-1

C) 4.5 x 10^-2

D) 2.43 x 10^-1

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Find the mean (average) the data set below? 2 18 28 5 4' 5'10'20

412.638 in expanded form using decimals