A varies directly as b\(^2\) when A = 4, b = 1. Find A when b = 2
A
12
B
14
C
16
D
11
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
A ∝ b\(^2\) so A = k b\(^2\).
Substitute: 4 = k · 1\(^2\),
k = 4.
When b = 2,
A = 4 · 4 = 16.
Source: WAEC / JAMB / NECO Classroom Archive (Record #74151)