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Ecosey123
26.06.2019 •
Mathematics
The length of a worm is 3.25 inches.write as a fraction in simplest form?
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Ответ:
3 1/4 is in simplest form
Step-by-step explanation:
Ответ:
A = 2A1 + A2
However, our cylinder has no top, so its area is: A = A1 + A2
The area of the circular base is: A1 = r²π
The area of lateral surface is: A2 = 2rhπ
A) The answer is C = 7r²π + 16rπh
The cost C of building the cylinder is:
C = 7 * A1 + 8 * A2
C = 7 * r²π + 8 * 2rπh
C = 7r²π + 16rπh
B) The answer is C = 7r²π + 5600/r
The volume of the cylinder is: V = r²πh
We have: V = 350 ft³
Hence: 350 = r²πh
h = 350/r²π
From the previous task (a) we have the total cost:
C = 7r²π + 16rπh
Let's just substitute h:
C = 7r²π + 16rπ(350/r²π)
C = 7r²π + 5600/r