7/2-49/4
4 is common denominator
14-49/4
-35/4
Answer A: 84π
Answer B: I'm also confused. If anyone else knows can you please help me also. Sorry for not answering B. I hope this helps though.
Step-by-step explanation:
Answer A:
V=1/3π 6^2 (7) Since 12 is a diameter you half it which is 6
V=1/3π 36(7)
V=1/3π 252
V= 252π/3
V=84π
Answer:

And replacing we got:

Step-by-step explanation:
We can define the random variable X as the thickness of a protective coating applied to a conductor designed to work in corrosive conditions. And the distribution for X is given by:

And we want to find this probability:

And in order to find this probability we can use the cumulative distribution function given by:

And if we use this formula for the probability desired we have:

And replacing we got:

Ratio is: 8:7
Because there are 8 girls against 7 boys