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3 years ago

2/3 rational or irrational

Mathematics

2 answers:

bogdanovich [222]3 years ago

7 0

Answer: 2/3 is a rational number

Step-by-step explanation:

Rational numbers are numbers that can be expressed in the form a/b , that is , the numbers that can be expressed as a fraction.

s2008m [1.1K]3 years ago

4 0

$\frac{2}{3} \: \: \: \red{is \: rational \: number}$

$because \: it \: express \: in \: form \: of \frac{p}{q} .$

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8. There are approximately 2.2046 kilograms in 1 pound. There are about 0.4536 pounds in 1 kilogram. To convert 112 lxs to kilog

Zanzabum

Answer:

Step-by-step explanation:

first of all the question is wrong 1 kilogram = 2.2046 pounds. and 1 pound = 0.4536kilogram.

if we want to convert 112lb into kilogram. we multiply it by 0.4536.

ie 112lb = 112x0.4536kg = 50.8032kg

to convert lb to kg you do this; lb x 0.4536

to convert kg to lb you do this; kg x 2.2046

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3 years ago

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3 years ago

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a_sh-v [17]

Answer:

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Step-by-step explanation:

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3 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

Which two values of x are roots of the polynomial below?<br> x2 + 5x+7

Dmitry [639]

Answer:

The roots are

$x=\frac{-5+i\sqrt{3}}{2}$ and $x=\frac{-5-i\sqrt{3}}{2}$

Step-by-step explanation:

we have

$x^{2} +5x+7$

To find the roots equate the polynomial to zero and cmplete the square

$x^{2} +5x+7=0$

$x^{2} +5x=-7$

$(x^{2} +5x+2.5^{2})=-7+2.5^{2}$

$(x^{2} +5x+6.25)=-0.75$

rewrite as perfect squares

$(x+2.5)^{2}=-0.75$

take square root both sides

$(x+2.5)=(+/-)\sqrt{-\frac{3}{4}}$

Remember that

$i=\sqrt{-1}$

substitute

$(x+2.5)=(+/-)i\sqrt{\frac{3}{4}}$

$(x+\frac{5}{2})=(+/-)i\frac{\sqrt{3}}{2}$

$x=-\frac{5}{2}(+/-)i\frac{\sqrt{3}}{2}$

therefore

The roots are

$x=\frac{-5+i\sqrt{3}}{2}$

$x=\frac{-5-i\sqrt{3}}{2}$

4 0

3 years ago