If x = 0.72 + 0.8 + 3.87 - 1.089, then number of significant digits in the value of x is______________

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answer is 2.

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Detailed Solution

x=0.72+0.8+3.87−1.089=4.301=4.3(The number of decimal points in addition or subtraction should equal to minimum number of decimal points of a quantity involved in the operation.) but x= 4.3 ; x is having two significant figures.Thus, the number of significant digits is 2.

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