Answer:
The first answer, 3 times the square root of x squared is correct.
Answer:
2/3
Step-by-step explanation:
that the ratio of that number
KE=1/2(m)(v)^2
KE=1/2(80)(1.5)^2
KE=90 J
Answer: ![cos(\pi-x)=-cos(x)](https://tex.z-dn.net/?f=cos%28%5Cpi-x%29%3D-cos%28x%29)
Step-by-step explanation:
We need to apply the following identity:
![cos(A - B) = cos A*cos B + sinA*sin B](https://tex.z-dn.net/?f=cos%28A%20-%20B%29%20%3D%20cos%20A%2Acos%20B%20%2B%20sinA%2Asin%20B)
Then, applying this, you know that for
:
![cos(\pi-x)=cos(\pi)*cos(x)+sin(\pi)*sin(x)](https://tex.z-dn.net/?f=cos%28%5Cpi-x%29%3Dcos%28%5Cpi%29%2Acos%28x%29%2Bsin%28%5Cpi%29%2Asin%28x%29)
We need to remember that:
and ![sin(\pi)=0](https://tex.z-dn.net/?f=sin%28%5Cpi%29%3D0)
Therefore, we need to substitute these values into
.
Then, you get:
![cos(\pi-x)=(-1)*cos(x)+0*sin(x)](https://tex.z-dn.net/?f=cos%28%5Cpi-x%29%3D%28-1%29%2Acos%28x%29%2B0%2Asin%28x%29)
![cos(\pi-x)=-1cos(x)+0](https://tex.z-dn.net/?f=cos%28%5Cpi-x%29%3D-1cos%28x%29%2B0)
![cos(\pi-x)=-cos(x)](https://tex.z-dn.net/?f=cos%28%5Cpi-x%29%3D-cos%28x%29)
Answer:
51
Step-by-step explanation:
Hope this helps