Suppose that, from measurements in a microscope, you determine that a certain layer of graphene covers an area of 1.50μm2. convert this to square meters.

1∙5µm² = ? m² 
1m * 1m = 1m²     But 1m = 1,000,000µm = 1x 10^6µm   1x10^6µm * 1x10^6µm = 1m²      1x 10^12µm² = 1m² (Now, try dividing both sides by 1x10^12).    1x10^12µm² /(1x10^12) = 1m² /(1x10^12)    1µm² = 0∙000 000 000 001 m² (multiply  both sides by by 1∙5).    1∙5µm² = 0∙000 000 000 0015 m²   

 1∙5µm² = 1∙5x 10^-12 m²
I am not the best in math but hope this helps you 

29.1-12=17.1the answer is this one

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