Solve the following with regard to significant figures.
(a) `sqrt(4.5 - 3.31)` (b) `5.9 xx 10^(5) - 2.3 xx 10^(4)`
` (c) 7.18 + 4.3 (d) 6.5 + 0.0136`

Explanation

(a) Among the two, the least number of significant after decimal is one
`sqrt(4.5 - 3.31) = sqrt(1.19) = 1.09`
(b) The number of minimum significant figures is 2
`5.9 xx 10^(5) - 2.3 xx 10^(4) = 5.9 xx 10^(5) - 0.23 xx 10^(5) = 5.67 xx 10^(10) = 5.7 xx 10^(10)`
(c) The lowest least number of significant digit after decimal is one
7.18 + 4.3 = 11.48 Rounding off we get 11.5
(d) The lowest least number of significant digit after decimal is one
6.5 +0.0136 = 6.5136 = 6.5