Answer:
D) h = A/2πr - r
Step-by-step explanation:
A = 2πr(r+h)
A = 2πr² + 2πrh
2πrh = A - 2πr²
h = (A-2πr²)/2πr
=A/2πr - 2πr²/2πr
=A/2πr - r
Are you supposed to multiply these? If so your answer would be (5x*x^2) + (5x*-x) + (5x*-7). This comes out to 5x^3 - 5x^2 - 35x. Hope this helps!
For this case we must solve the following system of equations:
![x + 3y = -4\\x + 5y = -6](https://tex.z-dn.net/?f=x%20%2B%203y%20%3D%20-4%5C%5Cx%20%2B%205y%20%3D%20-6)
We clear x of both equations:
![x = -4-3y\\x = -6-5y](https://tex.z-dn.net/?f=x%20%3D%20-4-3y%5C%5Cx%20%3D%20-6-5y)
We match:
![-4-3y = -6-5y\\-3y + 5y = -6 + 4\\2y = -2\\y = \frac {-2} {2}\\y = -1](https://tex.z-dn.net/?f=-4-3y%20%3D%20-6-5y%5C%5C-3y%20%2B%205y%20%3D%20-6%20%2B%204%5C%5C2y%20%3D%20-2%5C%5Cy%20%3D%20%5Cfrac%20%7B-2%7D%20%7B2%7D%5C%5Cy%20%3D%20-1)
We find the value of "x":
![x = -4-3 (-1)\\x = -4 + 3\\x = -1](https://tex.z-dn.net/?f=x%20%3D%20-4-3%20%28-1%29%5C%5Cx%20%3D%20-4%20%2B%203%5C%5Cx%20%3D%20-1)
Thus, the solution of the system is:
![(x, y): (- 1, -1)](https://tex.z-dn.net/?f=%28x%2C%20y%29%3A%20%28-%201%2C%20-1%29)
Answer:
![(x, y): (- 1, -1)](https://tex.z-dn.net/?f=%28x%2C%20y%29%3A%20%28-%201%2C%20-1%29)
Answer = a + 12
You take away 3a from 4a (which leaves a) and then take 7 away from 19 (which leaves 12)