1)
1. F(x) = 2.5(1-e-0.2x)
2. F(x) = x4/4+2/3x3/2 + 25/12
3. F(x) = ln(x) /7 +C
2)
1. K = - 1(There is negative sign in differentiation there will be - 4k=4)
2. K = - 1
3. K = 1/15
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