Circumference = 2πr = 31.4
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- After 25% decrease: 120 × 0.75 = 90
- Net change = (90 - 100)/100 × 100% = -10%
- A circle has a circumference of 31.4 meters. What is its area? (Use π ≈ 3.14)
- r = 31.4 / (2 × 3.14) = 5 meters
- Area = πr² = 3.14 × 5² = 3.14 × 25 = 78.5 square meters.
- #### 78.5Question: Let $ a $ and $ b $ be complex numbers such that $ a^2 + b^2 = 1 $ and $ ab = \frac{1}{2} $. Find $ |a^4 + b^4| $.
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