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Unformatted text preview: iLrn/CengageNOW info and hints: For typing answers into CengageNOW in the correct form , the best guides are the answers in the back of the book , the answers on the even answer overheads in the recitations, and the answers your lecturers recommend. HINT: When you have the palette with the math symbols to enter answers, the top row is actually a menu of choices. Click on the square root symbol and you will see a template for any root as a choice. HW 27 General: In CengageNOW, the inverse function problems are generally asking simply for an expression rather than an equation. There is a template button for f inverse of x, f^-1(x) that is available on the CengageNOW problems with the large equation palette, but you will not have to use it on most problems. It should be clear from the context of the problem. HW 27B #10- Find the subscript template on the palette HW 27B #11- Not 'l' or 'L', instead Illumination is 'I' or 'i'. Uppercase is better of course. If you are sure you are right, be careful and think carefully about the quantities before assuming that. HW 28A #7 – Some versions of the problem seem logical but are not completely accurate. Specifically, 12:00 AM is really midnight, 12:00 PM is Noon. Basically if you assume 12:00 AM means Noon, then the problem works fine. General: You should always give an exact answer unless asked to give an approximation, (a fraction, log(7), pi/3, etc.). General: If a problem tells you to use common logs, that means to use log base 10, (log(x), log(122/13), log(x+10), etc.) HW 29A #18- As in the answer to the similar problem that appears in the back of the book, CengageNOW does not want you to multiply out denominator of the fraction. HW 29B #15- For some reason, CengageNOW wants you to multiply out denominator of the fraction, unlike the answer in the back of the book for the similar problem. HW 30A 1,2, etc. General- There are a templates for logarithms of any base on the equation palette (any base, base e, and base 10). You can use log(a,b) where a is the base, but you do not have to. Kind of like frac(a,b) versus using the fraction template. HW 30A #4- The problem asks for 3 significant figures…Examples: 43.56743 should be rounded to 43.5, 5543 rounded to 5540, 778.987 rounded to 779, 14269 rounded to 14300, etc. HW 30A #7, 30B #7,8- type in answers in a function notation like f(x)=-2F(x+5), f(x)=-2g(x+5), etc. HW 30B #6 part 6 (may apply to a few other problems here and there as well) - regarding the y-intercept, when you plug zero in for x if you get something like log base 5 of 8, type it in as (0, log base 5 (8)), where the base '5' should be a subscript after the word 'log'. HW 30B #12- Follow the rounding directions for the answer explicitly and make sure you correctly interpret the problem and what type of answer is expected. However, keep in mind that if it takes 12.2 years to reach the target population, that the target population will not be reached when 12 years have passed, so the real and more...
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- Spring '09
- Inverse function, Inverse trigonometric functions, ILRN