Step-by-step explanation:
a) 24.7×52.3=1291.81
On rounding off to 3 significant digits we get
1290
b)
[tex] \sqrt{ {42}^{2} - {28}^{2} } [/tex]
[tex] \sqrt{1764 -784 } = \sqrt{980} [/tex]
=31.304951
On rounding off to 5 significant figures we get
=31.305
c)
[tex] \sqrt[3]{78} = 4.27265[/tex]
On rounding off to 2 significant figures we get
=4.3
Hence required answers
a)1290
b)31.305
c)4.3
I hope it helped you
