Final answer:
To find the value of log, 81, Janine can use the log button for the common logarithm (base 10) or the ln button for the natural logarithm (base e). If these functions aren't directly available, she can utilize exponentiation with 10x where x is the logarithm.
Step-by-step explanation:
To calculate the value of log, 81, Janine can use a few methods. Most straightforwardly, she can use the log button on her calculator, which will typically calculate the common logarithm (base 10) of the number she inputs. If Janine is looking for the common logarithm of 81, she would simply enter the number 81 and then press the log button. The display will then show her the logarithm of 81 to base 10.
If she is interested in computing the natural logarithm of 81, which is denoted as ln 81, she should press the corresponding ln (sometimes shown as In on calculators) button after entering 81. The calculator will then display the natural logarithm (base e) of 81.
In the event that her calculator does not have a direct ln or log function, Janine can use the calculator's exponentiation functions. For the common log, she would calculate 10x where x is the logarithm to find the original number. This is less common but can be necessary with some scientific calculators.