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Solve each logarithmic equation in Exercises 49–92. Be sure to reject any value of x that is not in the domain of the original logarithmic expressions. Give the exact answer. Then, where necessary, use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution.
90.
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Chapter 4 Solutions
COLLEGE ALGEBRA ESSENTIALS-MYMATHLAB
- In Exercises 16–18, write each equation in its equivalent logarithmic form. 16. 6 = 216 17. b' = 625 18. 13' = 874arrow_forwardIn Exercises 64–73, solve each exponential equation. Where necessary, express the solution set in terms of natural or common logarithms and use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution. 64. 24x-2 = 64 65. 125* = 25 %3D 66. 10 = 7000 67. 9*+2 = 27- 68. 8* = 12,143 69. 9esx = 1269 %3D 70. e12-5x - 7 = 123 71. 54r+2 = 37,500 %3D 72. 3*+4 = 72r-1 73. e2 - e - 6 = 0arrow_forwardFor Exercises 13–18, use the quotient property of logarithms to write the logarithm as a difference of logarithms. Then simplify if possible. (See Example 2) 13. logiz 14. log 15. In 1000 16. In 17. log 18. log 100arrow_forward
- In Exercises 41–67, use properties of logarithms to condense each logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Where possible, evaluate logarithmic expressions without using a calculator. 41. log5 + log2 57. 3ln x - 1/3ln y 67. 1/3 [2ln(x+5)-ln x-ln(x2 -4)]arrow_forwardAn exponential function,f (x), passes through the points(2, 5)and (8, 20). Determine the value of f(25) to the nearest integer.arrow_forwardYour cardiac index is your heart's output, in liters of blood per minute, divided by your body's surface area, in square meters. The cardiac index, C(x), can be modeled by 7.644 C(x) = 10 s xs 80, where x is an individual's age, in years. The graph of the function is shown. Use the function to solve Exercises 95–96. 7.644 C(x) = %3D 10 20 30 40 50 60 70 80 90 Age 95. a. Find the cardiac index of a 32-year-old. Express the denominator in simplified radical form and reduce the fraction. b. Use the form of the answer in part (a) and a calculator to express the cardiac index to the nearest hundredth. Identify your solution as a point on the graph. 96. a. Find the cardiac index of an 80-year-old. Express the denominator in simplified radical form and reduce the fraction. Cardiac Index liters per minute squar e met ers 654 32arrow_forward
- For Exercises 33–38, find the exact value of each expression without the use of a calculator. (See Example 5)arrow_forwardsolve, log(x)+log(x+1)=2 . please show work.arrow_forward2. Fill in the missing values to make the equations true. (a) log 7- log 5 = log , (b) log, 8 + log, U = log, 56 (c) log, 9 = log, 3 Continuearrow_forward
- log, 5 0.699 and log, 70.845. Use these values to evaluate log, 245 log,245= Quarrow_forward7) Solve for "x" in the equation log,(x + 2) -1 = 4 (3 decimal point accuracy). Page Q + 1 & 6 7 8 toarrow_forwardThe average amount A (in pounds per person) of fish and shellfish consumed in the UnitedStates during the period 1992–2001 can be modeled by A = (3.2x + 260)/(52x + 3800) where x is the number of years since 1992.Rewrite the model so that it has only whole number coefficients. Then simplify the model.arrow_forward
- Algebra & Trigonometry with Analytic GeometryAlgebraISBN:9781133382119Author:SwokowskiPublisher:Cengage