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Pani-rosa [81]
3 years ago
5

Which equations are correct?

Mathematics
1 answer:
stepan [7]3 years ago
5 0

Answer:

3y^5(2y^3+3)=−6y^8−9y^5

−2c^6(5c^3+6)=−10c^9−12c^6

are the correct equations.

Step-by-step explanation:

If you simply all these equations you will get following equations :

when bases are same and are in multiplication we add the exponents.

−4b^4(5b^2+6)=−20b^6−24b^4

−5x^3(3x^3+2)=−15x^6−10x^3

−3y^5(2y^3+3)=−6y^8−9y^5

−2c^6(5c^3+6)=−10c^9−12c^6

so equation 3 and 4 are correct.

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Hence, -45 is the number which when added to the given fraction will give 2/3

Further explanation:

Given fraction is:

\frac{23}{12}

Let x be the number which has to be added to numerator and denominator

Then

\frac{23+x}{12+x}=\frac{2}{3}

Cross-multiplying

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Hence, -45 is the number which when added to the given fraction will give 2/3

Keywords: Linear equation in one variable, Cross-multiplication

Learn more about linear equation at:

  • brainly.com/question/2088577
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3 years ago
A biologist is studying the composition of birds on a lake and counts 61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons. Fro
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Answer:

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Observed counts:

61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons.

Step-by-step explanation:

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The expected counts are:

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What the biologist counted were the observed counts.

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Answer:

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Step-by-step explanation:

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