6.7 # 18 At what rate do you need to invest money into a bank account earning continuously compounded interest if you want to double your money in 42 months?

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You move the constant to the right side and change its sign to be 9z= -6 -8. that’s the first step.the second step would be calculate the difference of -8-6 to get -14. you equation should now be 9z=-14the last step is to divide both sides by 9 to get z=-14/9hope this