The function u is the temperature at (x, y) throughout a thin rectangular plate witl Shae x = 0, x = 2 and y = 1 are all kept at zero temperatures. Side y sin , 0

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A: 9years +3 years =12 years r=3.5%t=11n=4 Payment received =1500×2×9+600×12×3=27000+21,600=$48,600

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