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3 years ago

Please help, this is geometry

Mathematics

1 answer:

SSSSS [86.1K]3 years ago

3 0

Answer:

Step-by-step explanation:

r = 3

angle = 50

Formula: Length = (angle/360) * 2 pi * r

Length = (50/360) * 2 * 3.14 * 3

Length = 0.13889 * 2 * 3.14 * 3

Length = 0.13899 * 6 * 3.14

Length = 2.6167

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How many moles of oxygen are required to burn 3.0 mole of C10H8 (naphthalene)?

astra-53 [7]

Answer: 36 moles oxygen

Step-by-step explanation:

C10H8 + 12O2 ====》 10CO2 + 4H2O

From the equation of the reaction,

1 mole of napth requires 12 moles of O2

3 moles of napth would require x moles O2

X = (3 * 12) / 1

X = 36 moles of oxygen.

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3 years ago

Im confused khan academy 8th grade

Anit [1.1K]

Answer:

Step-by-step explanation:

hi! so the question is asking what h is when you input -18 for x, right?

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let's see what the equation looks like now
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easy as that!

now let's do the math :)

because of PEMDAS, remember to do the fraction (dividing) first!
$h = 17 + (-3)$

we can change that to --> h = 17 - 3

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let me know if you're still confused!

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