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NARA [144]
3 years ago
11

Please help I dont get it​

Mathematics
1 answer:
SpyIntel [72]3 years ago
3 0

Answer:

B. 12cm

Step-by-step explanation:

We can double check by plugging in the number. However, the question trys to trick you, by giving you the diametre, but in order for the formula to work (V=4 /3πr^3), we will divide the diametre by 2 (12 ÷ 2= 6),

--------------------------------------------------------------------------------------------------------------

Once we do that, we can double check, when you plug in your numbers your answer will be around 900 (904.78, to be exact, but the question asks for approximate diamtetre).

----------------------------------------------------------------------------------------------------------------

Have a good day :)

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Answer:

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Step-by-step explanation:

Given: 8x² + 10x - 7 = 0

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1. Split the middle term:

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⇒ 14, -4 [find the product factors that add to the middle term's coefficient]

⇒ 8x² + 14x - 4x - 7 = 0 [rewrite with those factors replacing the middle term.]

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<u><em>Case 1:</em></u>

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⇒ 2x - 1 + 1 = 0 + 1

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\large \text{$x_1$}=-\dfrac{7}{4}, \large \text{$x_2$}=\dfrac{1}{2}

Learn more about quadratic equations here:

brainly.com/question/27750885

brainly.com/question/27739892

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