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Add 6.75 xx (10^3) cm to 4.52 xx (10^2) ...

Add `6.75 xx (10^3) cm` to `4.52 xx (10^2) cm` with regard to significant figures.

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The correct Answer is:
A, B, C
`a= 6.75 xx 10^3 cm`
`b= 4.52 xx 10^2 cm`
`=0.452 xx 10^(3) cm `
` = 0.452 xx 10^(3) cm `(upto 2 places of decimal)
`:. a+b = = (6.75 xx 10^(3)+ 0.45 xx 10^(3)) cm `
`=7.20 xx 10^3 cm `
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