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(a) Find a formula for the number of bacteria at time t. (b) Find the number of bacteria after one hour. (c) After how many minutes will there be 50 000 bacteria?
Simplify each of the following logarithmic expressions, giving the final answer as a number not involving a logarithm. a) log 24 log 32 2− b) log 96 3log 2 log 43 3 3− − c) 5 5 5 1 2 log 500 log log 10 5 + − d) 2log 54 log 0.25 4log 23 3 3− − e) 8log 2 log 4 3log 96 6 6− −( ) 3 , 1 , 3 , 6 , 6
Logarithm can be used to solve word problems. Practice finding missing variable that are identified in word problems and learn to find these values by evaluating logarithms.
1) Identify what they want. 2) Look at what is available. 3) See what formula fit all those aspects. 4) Plug in the number and bam, you have your solution. Example: Let's say the neighbor's cat keeps getting in your garbage and you want to scare him away.
Introduction to Logarithms. In its simplest form, a logarithm answers the question: How many of one number multiply together to make another number? Example: How many 2 s multiply together to make 8? Answer: 2 × 2 × 2 = 8, so we had to multiply 3 of the 2 s to get 8. So the logarithm is 3. How to Write it. We write it like this: log2(8) = 3.
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logarithmic model of the form y = a + b ln x where b < 0 for the data. To have the calculator find a regression equation of the form y = a + b ln x, use LnReg from the STAT CALC screen. The equation of a logarithmic function that models the data is y = 34.1786 - 5.6826 ln x.
