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3 years ago

12

A molecule of sodium carbonate contains 2 atoms of sodium to every 3 atoms of oxygen. Could a compound containing 12 atoms of so

dium and 15 atoms of oxygen be sodium carbonate ? Explain

1 answer:

lys-0071 [83]3 years ago

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4/3+căn5 - 8/1+căn5 +15/căn5

padilas [110]

Answer:

$A= \frac{4}{3 + \sqrt{5} } - \frac{8}{1 + \sqrt{5} } + \frac{15}{ \sqrt{5} }$

$= \frac{4(3 - \sqrt{5)} }{4} - \frac{8(1 - \sqrt{5} }{ - 4} + \frac{15 \sqrt{5} }{5} = 3 - \sqrt{5 + 2 - 2 \sqrt{5 + 3 \sqrt{5 = 5} } }$

Step-by-step explanation:

$Cảm \: ơn!!!!$

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2 years ago

Express your answer as a polynomial in standard form.

Musya8 [376]

Answer:

$f(g(x)) = 6x^2+6x+11$

Step-by-step explanation:

$f(g(x)) = 2(3x^2+3x+7) - 3\\f(g(x)) = 6x^2 + 6x + 14 - 3\\f(g(x)) = 6x^2+6x+11$

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2 years ago

GarryVolchara [31]

Lou has 800 pennies
Joe has 8 pennies
Therefore they have 808 pennies

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2 years ago

If a trader gained 15% by selling an

schepotkina [342]

Answer$67

Step-by-step explanation:

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2 years ago

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What is the measurement of angle A?

Morgarella [4.7K]

Answer:

51

Step-by-step explanation:

All triangles =180 degrees

180-78 = 102

Since this triangle is an isosceles triangle, that means that 2 sides are the same length, and that 2 angles are the same.

102/2 (you divide by 2 bc the angles unknown are the same measurement) and that equals 51 degrees

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2 years ago