16a.)

16a. In Exercises 11-19, write the expression as a single logarithm with a coefficient of 1. 10g10(x2 -16)-310g10(x + 4) + 210910X22a. Suppose that a certain principal is invested at 6% per annum compounded continuously. Use the rule of 70, T2 * 70/R, to estimate the doubling time. 24a. In Exercises 20-26, write the quantity using sums, differences, and constant multiples of simpler logarithmic expressions. Express the answer so that logarithms of products, quotients, and powers do not appear. x+ 3 109 b JW X28a. In one savings account, a principal of $1000 is deposited at 5% per annum. In a second account, a principal of $500 is deposited at 10% per annum. Both accounts compound interest continuously. Estimate the doubling time for each account. 403. In Exercises 39 and 40, suppose that In x = t and In 3: = u. Write each expression in terms oft and u. |n(e'" \"II