Question on: JAMB Mathematics - 1990
Correct 241.34(3 x 10-3)2 to 4 significant figures
A
0.0014
B
0.001448
C
0.0022
D
0.002172
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Correct Option: D
first work out the expression and then correct the answer to 4 s.f = 241.34..............(A)
(3 x 103)2............(B)
= 32x
= \(\frac{1}{10^3}\) x \(\frac{1}{10^3}\)
(Note that x2 = \(\frac{1}{x^3}\))
= 24.34 x 32 x \(\frac{1}{10^6}\)
= \(\frac{2172.06}{10^6}\)
= 0.00217206
= 0.002172(4 s.f)
(3 x 103)2............(B)
= 32x
= \(\frac{1}{10^3}\) x \(\frac{1}{10^3}\)
(Note that x2 = \(\frac{1}{x^3}\))
= 24.34 x 32 x \(\frac{1}{10^6}\)
= \(\frac{2172.06}{10^6}\)
= 0.00217206
= 0.002172(4 s.f)
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