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2 years ago

Is -1 1/4 a rational number? yes no Submit

Mathematics

2 answers:

lys-0071 [83]2 years ago

6 0

Answer:

Yes

Step-by-step explanation:

-1 1/4 is a rational number. Irrational numbers cannot be written as simple fractions, and -1 1/4 can.

worty [1.4K]2 years ago

4 0

Yes because the answer is -2.75 and it stops so that makes it a rational number.

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2 years ago

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RoseWind [281]

Answer:

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3 years ago

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barxatty [35]

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Step-by-step explanation:

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2 years ago

Read 2 more answers

Implicit differentiation of 1/x +1/y=5 y(4)= 4/19 y'(4)=?

Aneli [31]

$\frac{1}{x} +\frac{1}{y} = 5\\\\x^{-1}+y^{-1}=5\\$

Above, I changed the fraction form of x and y into exponential form so it is easier to see the differentiation. Now, we can differentiate:

$-1x^{-2}+-1y^{-2}\frac{dy}{dx}=5\\\\\frac{-1}{x^2}-\frac{1}{y^2}\frac{dy}{dx}=5\\\\-\frac{1}{y^2}\frac{dy}{dx}=5+\frac{1}{x^2}\\\\\frac{dy}{dx}=-5y^2-\frac{y^2}{x^2}$

Now that we have dy/dx, we can plug in the x, which is 4, and the y, which is 4/19. We know these values of x and y because your question stated y(4) = 4/19.

$\frac{dy}{dx}=-5(\frac{4}{19})^2-\frac{(\frac{4}{19})^2}{(4)^2}\\\\\frac{dy}{dx}=-5(\frac{16}{361})-\frac{(\frac{16}{361})}{16}\\\\\frac{dy}{dx}=\frac{-80}{361}-\frac{1}{361}\\\\\frac{dy}{dx}=\frac{-81}{361}$

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3 years ago