Answer
a, $31.5\times10^{2}$
b, $3921$
c, $2$
d, $87.0$
Work Step by Step
When determining the correct number of significant figures in the result of multiplication and division calculations, The result of a multiplication or division should carry the same number of significant figures as the factor with the least number of significant figures.
In addition and subtractions, the answer must be rounded off to the same precision as the least number precise number in the calculations.
a,$31.5\times10^{2}$
b, $3921$
c, $2$
d, $87.0$
