Answer: Due to its anonymous nature, if you lose your cash, it's gone. Payment cards can be cancelled and replaced swiftly and remotely. Whilst cash may offer you complete anonymity from data thieves, EMV chip enabled cards offer a more thorough form of payment authentication, providing an extra layer of payment security
So, therefore, C.
Answer:
20 i think
Step-by-step explanation:
Answer:
x = 180
Step-by-step explanation:
First, you need to know
1. Double-angle formula:
cos(2x) = ![cos^{2}x - sin^{2}x](https://tex.z-dn.net/?f=cos%5E%7B2%7Dx%20-%20sin%5E%7B2%7Dx)
2. Pythagorean identity:
![cos^{2}x + sin^{2}x = 1](https://tex.z-dn.net/?f=cos%5E%7B2%7Dx%20%2B%20sin%5E%7B2%7Dx%20%3D%201)
Back to your problem, replacing the variable by the above:
![5cosx-sin\frac{x}{2}+7 = 0](https://tex.z-dn.net/?f=5cosx-sin%5Cfrac%7Bx%7D%7B2%7D%2B7%20%3D%200)
By Double-angle formula
By Pythagorean identity
Given ![y = \frac{x}{2}](https://tex.z-dn.net/?f=y%20%3D%20%5Cfrac%7Bx%7D%7B2%7D)
![5(1-2sin^{2}y) - 2siny + 7 = 0](https://tex.z-dn.net/?f=5%281-2sin%5E%7B2%7Dy%29%20-%202siny%20%2B%207%20%3D%200)
![10sin^{2}y+2siny-12=0](https://tex.z-dn.net/?f=10sin%5E%7B2%7Dy%2B2siny-12%3D0)
![5sin^{2}y+siny-6=0](https://tex.z-dn.net/?f=5sin%5E%7B2%7Dy%2Bsiny-6%3D0)
, we know -1 < sinx < 1, for every x ∈ R
![siny = 1, y =90](https://tex.z-dn.net/?f=siny%20%3D%201%2C%20y%20%3D90%20)
![y = \frac{x}{2}](https://tex.z-dn.net/?f=y%20%3D%20%5Cfrac%7Bx%7D%7B2%7D)
![x = 180](https://tex.z-dn.net/?f=x%20%3D%20180)
The answer is 49 because it is
Set up a proportion with the similar sides. Then you should find what KB is. Sorry I couldnt answer directly. Im actually doing math right now