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Logarithms and Depreciation Method

Solve this equation for x, using logarithm 20=3(1.08)(to the power of) x

Suppose a machine is worth 33000 after 4 years and 18000 after 8. Find the rate of depreciation using the linear depreciation method

If the total value of sales, s (in £000) is given by the equation s=500(1-e(to the power of) -0.16t), where time t is given in weeks, starting with t=0 when the product is first marketed. Find the value of total sales at the end of 2 weeks.

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