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Molodets [167]
3 years ago
6

I need help please now

Mathematics
1 answer:
Arlecino [84]3 years ago
3 0

Answer:

x=12

Step-by-step explanation:

This is an equilateral triangle.  That means all the angles are equal

There are three angles  and they add to 180.  180/3 =60.  Each angle is equal to 60

4x+12 =60

Subtract 12 from each side

4x+12-12 = 60-12

4x = 48

Divide by 4

4x/4 =48/4

x=12  

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If you add 21 to my number and then multiply the result by 3, you will get 84 more than two-thirds of my number. Find my number.
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Based on the calculations, the unknown number is equal to \frac{-45}{7}

  • Let the unknown number be x.

<h3>How to find an unknown number:</h3>

Translate the word problem into an algebraic expression, we have;

Adding 21 to the unknown number:

21 +x

Multiplying the result by 3:

3\times (21+x)

84 more than two-thirds of the unknown number:

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Equating the equations, we have:

3\times (21+x) = \frac{2x}{3} +84\\\\43+3x=\frac{2x}{3} +84

Cross-multiplying, we have:

43+3x=\frac{2x}{3} +84\\\\129+9x=2x+84\\\\9x-2x=84-129\\\\7x=-45\\\\x=\frac{-45}{7}

Read more on word problems here: brainly.com/question/13170908

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