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3 years ago

2m/7 + 3m/14=1 what is the variable m

Mathematics

2 answers:

Tresset [83]3 years ago

6 0

The variable m=2
got it?

sukhopar [10]3 years ago

6 0

I think m would be 2

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Please, please help with this question!! I don't understand it!

Kazeer [188]

Answer:

Step-by-step explanation:

Find the area of each shape, then multiply by 20, then round to nearest hundred.

Half circle:

=πr²/2

=50π

=157.08

Large square:

=L•w

=20(22)

=440

Small square:

=L(w)

=12(3)

=36

Triangle:

=b(h)/2

=8(3)/2

=12

Btu req:

=(157.08+440+36+12)(20)

=(645.08)(20)

=12901.6

=12900 BTU

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2 years ago

Prove that C(50,3) + C(50,4) = C(51,4)

valkas [14]

By definition of the binomial coefficient,

$C(n,k) = \dfrac{n!}{k!(n-k)!}$

so we have

$C(50,3) + C(50,4) = \dfrac{50!}{3!47!} + \dfrac{50!}{4!46!} \\\\ = \dfrac{50!}{3!46!} \left(\dfrac1{47} + \dfrac14\right) \\\\ = \dfrac{50!}{3!46!} \times \dfrac{51}{188} \\\\ = \dfrac{51!}{3!46!} \times \dfrac1{4\times47} \\\\ = \dfrac{51!}{4!47!} \\\\ = \dfrac{51!}{4!(51-4)!} = C(51,4)$

as required.

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2 years ago

Find 5-(-7)=5+7 simplify

lora16 [44]

Answer:

You already did the question.

Step-by-step explanation:

What's there to simplify?

5+7 = 5+7

It's just recursive.

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2 years ago

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Note: a radioactive decay constant is always negative.

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time = ln (5/6) / -.00011
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3 years ago

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Leno4ka [110]

Linear regression - the relation between variables when the regression equation is linear: e.g., y = ax + b

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3 years ago