a) Solve the differential equation dy c- dx + ry = x°y°, y(0) = 2 and write the solution in term of constant c. b) The concentration of a certain substance, r(mg/L) over time t(hours) is represented by dx -kx, dt where k is a constant. The initial concentration of 15mg/L decreases 50% in 5 hours. Find the time taken for the concentration to be 10% of its initial concentration.

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