QUESTION 9 dz (1+4r) dr – z?, for z (0) =4- Find the solution z(r) of: O a. none of the above 4 O b.2= 1- In (1+4r) 4. Oc. z= 1+ In (1+4r) O d., 4 1- 4ln (1+4r) 4. O e. z= 1+4ln (1+4r)

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