Question

2.1 x 10^10 OVER 7 x 10^17

Answer 1

2.1 times 10 to the tenth power equals 21,000,000,000. 7 times 10 to the seventeenth power equals  700,000,000,000,000,000. 700,000,000,000,000,000 divided by 21,000,000,000 equals 333,333,33.3 continusly.

Answer 2

2.1 x 10^10/ 7 x 10^17 
= 3 x 10^-8

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