And the theory of biorhythms, the sine function of the form PT equal 50 sine Omega t + 50 is used to measure the percent P of a person's potential at time T, where T is measured in days and t = 0 is the person's birthday. 3 characteristics are commonly measured, the physical potential, emotional potential, and intellectual potential. So we want to find Omega for each characteristic. So remember that in the sine graph, our regular period's 2π. So now we're just really doing 2π / 20, three 2π / 28, and 2π / 33. And the 2π / 28 we can see really just reduces to π / 14. So the next part of this is we want to figure out how to graph it. And so when we go into graphing calculators, we're going to go to the home key 1st and we need to look at settings and we're going to look at document settings. I would suggest making the display digits be on float and make sure your angle is in radians, exponential format, normal, real, auto. For calculation. I'm going to call, tell it to make it the default and hit OK. Then I've actually typed in the equations, but to type them in, you're going to go to the home key and a new document, or in my case I'm doing current document, but when you do a new document you want to do graphing. So control G is what we'll bring on our line, and I can arrow up to see the different equations I've already put in. I have to use X instead of T because this is F1 of X, not F1 of T. So I put in all three of my equations. I can see that they're highlighting them appropriately. Now the next thing we're going to do is we need to go to menu and we need to look at the window. So the window settings said we went originally zero to, I forgot 50, I think counting by 10 and then zero to 100, counting by 10. So that's the original graph it wanted. And then it had a Part D and the Part D talked about. We have somebody who's 44 years old, SO16O71 and we want to know what's happening in the next 30 days. So 16 O seven 1 + 30. So going back to our calculator, 16O71 menu, the window again, SO16O71 and if I add 30 to that, we're going to get 16 one O 1 and I'm going to hit OK. So from here under menu, I'm going to analyze the graph and I want to find the maximum. If I highlight the various graphs, they actually will get dark for me. So if I say I want this graph 2, let's say, see how it says graph 2 on it. If I click on graph 2 and I will ask me a lower bound and then it'll ask me an upper bound and right there is my number. Now that's not really telling me what I need it to tell me because I need it to give me more. So if I highlight it and do a control plus, Nope, that didn't work. If I highlight it and go under menu and go under attributes, the attributes are going to let me figure out how many places I want. So attributes, it says 3, so I'm going to just arrow over right here so that I get more places. When I hit enter, I can see that this is going to give me 16 O 79. This other graph here was giving me, if I grab it and move it, 16 O 82.75 and 16 O 79.25. So this is pretty close to all three of them being In Sync on the same time, but they're not exactly In Sync. So that answers our question. Is there a time when all three are 100% potential? No. And then suppose that a person's 44 years old today, describe the next time the person's at the physical peak, etcetera, we get off the graph. Hope this helps.