Answer:
A. Chemical to electric energy
Step-by-step explanation:
The cells in the device undergo a chemical process to produce electric energy first
Answer:
138 students
Step-by-step explanation:
207/9 = 23
23*6=138
The correct answer is -1/3.
Answer:
![(h+f)(x)=3x^2-9x-2](https://tex.z-dn.net/?f=%28h%2Bf%29%28x%29%3D3x%5E2-9x-2)
Step-by-step explanation:
![f(x)=2x^2-9x+2\\g(x)=1-6x\\h(x)=x^2-4](https://tex.z-dn.net/?f=f%28x%29%3D2x%5E2-9x%2B2%5C%5Cg%28x%29%3D1-6x%5C%5Ch%28x%29%3Dx%5E2-4)
Looks like g(x) is irrelevant here.
You can expand this like so:
![(h+f)(x)\\h(x)+f(x)](https://tex.z-dn.net/?f=%28h%2Bf%29%28x%29%5C%5Ch%28x%29%2Bf%28x%29)
And even further:
![(x^2-4)+(2x^2-9x+2)](https://tex.z-dn.net/?f=%28x%5E2-4%29%2B%282x%5E2-9x%2B2%29)
Now, it's just a matter of simplifying.
![x^2-4+2x^2-9x+2\\\\(x^2+2x^2)+(-9x)+(-4+2)\\\\3x^2-9x-2](https://tex.z-dn.net/?f=x%5E2-4%2B2x%5E2-9x%2B2%5C%5C%5C%5C%28x%5E2%2B2x%5E2%29%2B%28-9x%29%2B%28-4%2B2%29%5C%5C%5C%5C3x%5E2-9x-2)
Therefore:
![(h+f)(x)=3x^2-9x-2](https://tex.z-dn.net/?f=%28h%2Bf%29%28x%29%3D3x%5E2-9x-2)