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kvv77 [185]
2 years ago
8

If 12a 3b=1 and 7b–2a=9 what is the average of a and b.

Mathematics
1 answer:
GaryK [48]2 years ago
8 0

Answer:

b

Step-by-step explanation:

If 12a + 3b = 1 and 7b – 2a = 9, what is the average (arithmetic mean) of a and b ? Add 12a+3b= 1 and 7b-2a=9, then we will get 10a+10b=10 which results 10(a+b)=10. Thus a+b=1. Therefore, the answer is B

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Answer:

Volume of cylinder is 6285.71 square units.

Step-by-step explanation:

Given the radius of cylinder 10 units. The height is twice its radius. we have to find its volume.

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Also given height is twice its radius.

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<h2><em><u>Volume of cylinder=πr^2h</u></em></h2>

= 22/7 × 100×20

=22/7 × 2000

= 44000/7

= 6285.71square units.

hence, volume of cylinder is 6285.71 square units.

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Answer:

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