Perform the following calculations to proper number of significant figures.
(a) 108/7.2
(b) `(1.6 xx 10^(2))^(2)`
(c ) `((1.35 xx 10^(-6))(0.4))/5.6`
(d) `(3.25 xx 0.0862)/4.002`
( e) `(1.0042 - 0.0034)(1.23)`

Answer

A, B, C, D

Explanation

(a) `108/7.2=15`, (upto 2 significant numbers)
(b) `(1.6 xx 10^(2))^(2) = 2.56 xx 10^(4)`
or `=2.6 xx 10^(4)` (upto 2 significant numbers)
( c) `((1.35 xx 10^(-6))(0.4))/5.6 = 0.096 xx 10^(-6) = 0.1 xx 10^(-6)`
or `=1 xx 10^(-7)` (upto one significant figure)
(d ) `(3.25 xx 0.08621)/4.002 =0.0700` (upto 3 significant figures)
( e) `(1.0042 - 0.0034)(1.23) (1.0008) (1.23) = 1.23` (upto 3 significant figures)