Answer:
A
Step-by-step explanation:
Find the common factors between the 2:
2πr + 4πrh
2 (πr+2πrh)
2πr (1 + 2h)
The number of boats are 8; so, he needs a total of 8*126 gallons.
In order to get the partial products, first you have to decompose 126 in its hundreds, tens and ones, that is, 126 = 100 + 20 + 6. Then multiply each of this terms by 8, as follows
8*100 = 800
8*20 = 160
8*6 = 48
Finally you have to add the results of these multiplications, that is, 800 + 160 + 48 = 1008. Therefore, he needs 1008 gallons for all the boats.
I think your answer might be 19.5
Step-by-step explanation:
Okay, so...
The Median of a trapezoid is directly in the middle. For some weird mathimatical reason you won't ever need to know unless it's on an exam or you become a math major, its midsegment is the average of the top length and the bottom length.
In other words,
EF = ( BC + AD ) / 2
So for part 1, we can use that equation to find x.

![4x-18=[(x+12)+(3x-4)]/2](https://tex.z-dn.net/?f=4x-18%3D%5B%28x%2B12%29%2B%283x-4%29%5D%2F2)
- Simplify within parentheses.
![4x-18=[x+12+3x-4]/2](https://tex.z-dn.net/?f=4x-18%3D%5Bx%2B12%2B3x-4%5D%2F2)
![4x-18=[x+3x+12-4]/2](https://tex.z-dn.net/?f=4x-18%3D%5Bx%2B3x%2B12-4%5D%2F2)
![4x-18=[4x+8]/2](https://tex.z-dn.net/?f=4x-18%3D%5B4x%2B8%5D%2F2)




Part 2 is a lot easier now. All we have to do is plug in 11 for x.



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Answer:
Part I: x = 11
Part II: