Answer
a - 7.6 x $10^{-1}$ ( to three significant figures)
b- 1.63 x $10^{1}$( to three significant figures)
c- 4.76 x $10^{2}$
d- 1.12 x $10^{-1}$ ( to three significant figures)
Work Step by Step
a -To find $\frac{56.1-51.1}{6.58}$
$\frac{56.1-51.1}{6.58}$ = $\frac{5}{6.58}$
$\frac{56.1-51.1}{6.58}$ = 0.759 or $\frac{56.1-51.1}{6.58}$ = 0.76 ( to three significant figures) or 7.6 x $10^{-1}$
b - To find $\frac{56.1+51.1}{6.58}$
$\frac{56.1+51.1}{6.58}$ = $\frac{107.2}{6.58}$
$\frac{56.1+51.1}{6.58}$ = 16.29 or $\frac{56.1+51.1}{6.58}$ = 16.3 ( to three significant figures) or 1.63 x $10^{1}$
c - To find:
(9.1 + 8.6) x 26.91 = 17.7 x 26.91 = 476.31 . This number expressed to three significant figures is 476 or 4.76 x $10^{2}$
d - To find:
0.0065 x 3.21 + 0.0911 = 0.0209 + 0.0911 = 0.1120. This number can be written as 1.12 x $10^{-1}$ ( to three significant figures)
