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I am currently doing an online course,so I don't have a teacher to ask.

Current chapter was dealing with combining questions.

An example would be $\frac1x \sin(x)=y$, where we would draw individual graphs and then the combined one as well. I have looked on Google and cannot find any material for me to learn how to combine them graphically.

Example Question

This is one of the questions I am supposed to be able to do,and yet I do not even know where to start! I can find the answer online but I need to learn this stuff for university so that's not the point!

Do you guys know where I can find resources to learn this stuff? My material does not explain anything at all!

Thank You!

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closed as unclear what you're asking by Normal Human, user251257, HowDoIMath, S.Panja-1729, Claude Leibovici Sep 30 at 8:21

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

What does the question about graphing have to do with problem 73? I don't see any graph in it. – Ross Millikan Aug 18 '13 at 1:04

1 Answer 1

up vote 1 down vote accepted

If problem 73 is your real question, it leads you through it. Let $c$ be the rotation speed of the pedals in rpm, $g$ the gear ratio (dimensionless), and $d$ the diameter of the rear wheel in inches. The point of the gear ratio is that if the front gear has $49$ teeth and the rear gear has $14$ teeth, the rear wheel will turn $\frac {49}{14}=\frac 72=3.5$ times for every turn of the pedals. The rotation rate of the rear wheel is then $cg$. The speed of the bike is this times the circumference of the rear wheel. The units I have chosen give the speed in inches per minute, so you need to convert to km per hour.

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Thanks it makes sense now! – LoadingCode Aug 18 '13 at 2:46

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