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4 years ago

Express 80 miles per hour in kilometers per hour

Mathematics

2 answers:

Anna [14]4 years ago

8 0

80 miles per hour is 128.74752 kilometers per hour

nataly862011 [7]4 years ago

5 0

It is 128.748 kilometers per hour

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Which statements are always true about regular polygons

Feliz [49]

Answer:

The answer is...

Step-by-step explanation:

Each interior angle measures 108 degrees. All of the angles are congruent. The sum of the measures of the interior angles is 108(5-2) degrees.

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3 years ago

A Physician orders acetaminophen elixir 6mg/kg/dose for a child who weighs 65 lbs.

storchak [24]

1kg = 2.205lbs
6mg for 2.205lbs
65 x 6 = 390
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3 years ago

Melanie needs 5,000 chocolates for an event so far she has brought 2 cases of 1,125 chocolates each how many more does she need

slava [35]

Answer:

2750 chocolates

Step-by-step explanation:

Find how much she has bought already:

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So, she still needs 2750

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3 years ago

Read 2 more answers

Let <img src="https://tex.z-dn.net/?f=%5Calpha" id="TexFormula1" title="\alpha" alt="\alpha" align="absmiddle" class="latex-form

Margarita [4]

Answer:

$|\alpha| = 2$

Step-by-step explanation:

Since $\alpha$ and $\beta$ are complex conjugates, let's define them as follows:

$\alpha = a+bi$

$\beta = a-bi$

$\frac{\alpha}{\beta^2}=\frac{a+bi}{a^2-b^2-2abi} =\frac{(a+bi)*(a^2-b^2+2abi)}{(a^2-b^2-2abi)*(a^2-b^2+2abi)} =\frac{a^3-3ab^2+(3a^2b-b^3)i}{a^4+2a^2b^2+b^4}$

Since $\frac{\alpha}{\beta^2}$ is a real number, complex part of above result must be zero.

$3a^2b-b^3=0$

From to hold above equality, $b=0$ or $b^2=3a^2$ .

However, since $|\alpha-\beta|=2\sqrt 3$ , $b\neq 0$

So, $b =\sqrt 3 a$ or $b =-\sqrt 3 a$

And since $\alpha$ and $\beta$ are complex conjugates, taking plus or minus sign as found above will not affect the result, so let's write the last version of $\alpha$ and $\beta$ as follows:

$\alpha = a+\sqrt 3 ai$