Question

Need some help with this question in the image

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Answer 1

Explanation:

a) 24.7×52.3=1291.81

On rounding off to 3 significant digits we get

1290

b)

`\sqrt{ {42}^(2) - {28}^(2) }`

`√(1764 -784 ) = √(980)`

=31.304951

On rounding off to 5 significant figures we get

=31.305

c)

`\sqrt[3]{78} = 4.27265`

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