JAMB Mathematics 2019 Paper

Concept:First evaluate the power and the multiplication in the denominator, then divide the results and round any decimal to the required significant figures.Explanation:Work out the numerator first.$(0.5436)^3 = 0.160634321856$Work out the denominator next.$0.017 \times 0.219 = 0.003723$Now divide the numerator by the denominator.$$\frac{0.160634321856}{0.003723} = 43.1464...$$To round to 3 significant figures, look at the fourth significant digit.For $43.1464...$, the third significant digit is $1$ and the next digit is $4$.Since $4 < 5$, the $1$ remains unchanged.Therefore, the value is $43.1$ to 3 significant figures.This is option B.Answer:$B.\ 43.1$