Answer:
CORRECTTT
Step-by-step explanation:
BRAINLIEST PLEASEEE
There is no image how do you expect me to help
Answer:
Yes, I agree
Step-by-step explanation:
See attachments for cone
Cone A
![h = 2r](https://tex.z-dn.net/?f=h%20%3D%202r)
Cone B
R = 2r
![h=r](https://tex.z-dn.net/?f=h%3Dr)
The volume of a cone is
![V = \frac{1}{3}\pi r^2h](https://tex.z-dn.net/?f=V%20%3D%20%5Cfrac%7B1%7D%7B3%7D%5Cpi%20r%5E2h)
For cone A, we have:
![V = \frac{1}{3}\pi r^2*2r](https://tex.z-dn.net/?f=V%20%3D%20%5Cfrac%7B1%7D%7B3%7D%5Cpi%20r%5E2%2A2r)
![V_A = \frac{2}{3}\pi r^3](https://tex.z-dn.net/?f=V_A%20%3D%20%5Cfrac%7B2%7D%7B3%7D%5Cpi%20r%5E3)
For cone B, we have:
![V = \frac{1}{3}\pi *(2r)^2 * r](https://tex.z-dn.net/?f=V%20%3D%20%5Cfrac%7B1%7D%7B3%7D%5Cpi%20%2A%282r%29%5E2%20%2A%20r)
![V = \frac{1}{3}\pi *4r^2 * r](https://tex.z-dn.net/?f=V%20%3D%20%5Cfrac%7B1%7D%7B3%7D%5Cpi%20%2A4r%5E2%20%2A%20r)
![V_B = \frac{4}{3}\pi r^3](https://tex.z-dn.net/?f=V_B%20%3D%20%5Cfrac%7B4%7D%7B3%7D%5Cpi%20r%5E3)
So, we have:
![V_B = 2 * \frac{2}{3}\pi r^3](https://tex.z-dn.net/?f=V_B%20%3D%202%20%2A%20%5Cfrac%7B2%7D%7B3%7D%5Cpi%20r%5E3)
Substitute ![V_A = \frac{2}{3}\pi r^3](https://tex.z-dn.net/?f=V_A%20%3D%20%5Cfrac%7B2%7D%7B3%7D%5Cpi%20r%5E3)
![V_B = 2 * V_A](https://tex.z-dn.net/?f=V_B%20%3D%202%20%2A%20V_A)
Make VA the subject
![V_A = \frac{1}{2}V_B](https://tex.z-dn.net/?f=V_A%20%3D%20%5Cfrac%7B1%7D%7B2%7DV_B)
Hence, I agree with Ahmad
Construct a 99% confidence interval for life
expectancy of a new GE light bulb:<span>
n = 64
Xbar = 750
s.d. = 20
Critical z value at 99% confidence = 2.576
margin of Error, E = 2.576*20/√64 = 6.44
<span>99% confidence interval for life expectancy of a
new GE light bulb = (Xbar - E; Xbar + E) = (743.56; 756.44)</span></span>