could use some help with these please and thank you.

4. Determine the growth constant, k, of a population that is growing at a rate proportional to its size, where the population doubles every 2 months. 5. The decay constant for a particular radioactive element is 0.015 when time is measured in years. Find the half-life of this element. 6. $3,000.00 is deposited into a saving account that earns 1.5% interest compounded continuously. a. What is the formula for A() , the balance after / years? b. What differential equation is satisfied by A(), the balance after / years? c. How much money will be in the account after 10 years? d. When will the balance reach $5,000.00? e. How fast is the balance growing when it reaches $5,000.00