First the person with a flashlight and one of his friends cross the bridge. After that same person with a flashlight comes back and leads another friend to the other side. Finally he comes back again and leads the last of them.
Number of times that he will have to cross the bridge is 5 ( five ).
Answer:
![\huge \boxed{\red{ \boxed{ - \cos(x) + C}}}](https://tex.z-dn.net/?f=%20%5Chuge%20%5Cboxed%7B%5Cred%7B%20%5Cboxed%7B%20%20-%20%20%5Ccos%28x%29%20%20%2B%20C%7D%7D%7D)
Step-by-step explanation:
<h3>to understand this</h3><h3>you need to know about:</h3>
<h3>tips and formulas:</h3>
<h3>let's solve:</h3>
![\sf \: rewrite \: \tan( \theta) \: as \: \dfrac{ \sin( \theta) }{ \cos( \theta) } : \\ = \displaystyle \int \: \frac{ \sin(x) }{ \cos(x) } \cos(x) \: dx \\ = \displaystyle \int \: \frac{ \sin(x) }{ \cancel{\cos(x) }} \: \cancel{ \cos(x)} \: dx \\ = \displaystyle \int \: \sin(x) \: dx](https://tex.z-dn.net/?f=%20%5Csf%20%5C%3A%20rewrite%20%5C%3A%20%20%5Ctan%28%20%5Ctheta%29%20%20%5C%3A%20%20as%20%5C%3A%20%20%20%5Cdfrac%7B%20%5Csin%28%20%5Ctheta%29%20%7D%7B%20%5Ccos%28%20%5Ctheta%29%20%7D%20%20%3A%20%20%5C%5C%20%20%20%3D%20%20%5Cdisplaystyle%20%20%5Cint%20%5C%3A%20%20%5Cfrac%7B%20%5Csin%28x%29%20%7D%7B%20%5Ccos%28x%29%20%7D%20%20%5Ccos%28x%29%20%20%5C%3A%20dx%20%5C%5C%20%20%20%3D%20%5Cdisplaystyle%20%5Cint%20%5C%3A%20%20%5Cfrac%7B%20%5Csin%28x%29%20%7D%7B%20%5Ccancel%7B%5Ccos%28x%29%20%7D%7D%20%20%20%5C%3A%20%5Ccancel%7B%20%5Ccos%28x%29%7D%20%20%5C%3A%20dx%20%5C%5C%20%20%20%20%20%3D%20%5Cdisplaystyle%20%5Cint%20%5C%3A%20%20%5Csin%28x%29%20%20%20%5C%3A%20dx)
![\sf \: use \: the \: formula : \\ \sf \displaystyle - \cos(x)](https://tex.z-dn.net/?f=%20%20%5Csf%20%5C%3A%20use%20%5C%3A%20the%20%5C%3A%20formula%20%3A%20%5C%5C%20%20%20%5Csf%20%5Cdisplaystyle%20%20%20%20%20-%20%5Ccos%28x%29%20%20)
![\sf add \: constant : \\ - \cos(x) + C](https://tex.z-dn.net/?f=%20%5Csf%20add%20%5C%3A%20constant%20%3A%20%20%5C%5C%20%20%20-%20%20%5Ccos%28x%29%20%20%2B%20C)
![\text{And we are done!}](https://tex.z-dn.net/?f=%5Ctext%7BAnd%20we%20are%20done%21%7D)
Answer:
7.5
Step-by-step explanation:
Using pythagoras theorem
Sqrt(9^2-5^2)=7.483
It’s not a function because when it’s graphed put it doesn’t pass the vertical line test