Jambmaths question:
Evaluate $\frac{{{(0.5625)}^{2}}-{{(0.4375)}^{2}}}{0.04}$ correct to 3 significant figures
Option A:
3.13
Option B:
3.12
Option C:
3.11
Option D:
0.313
Jamb Maths Solution:
$\begin{align} & \frac{{{(0.5625)}^{2}}-{{(0.4375)}^{2}}}{0.04}=\frac{(0.5625-0.4375)(0.5625+0.4375)}{0.04} \\ & =\frac{0.125\times 1}{0.04}=3.125 \\ & \simeq 3.13\text{ (3s}\text{.f)} \\\end{align}$
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