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Westkost [7]
3 years ago
9

3(2 + 4) = 60 5 + 1 = 8 − 23 can someone help me please

Mathematics
2 answers:
Lelechka [254]3 years ago
8 0

Answer:

I am trying to help you, but i need to know the content of the question. What am i trying to do? Simplify? Explain? Say if true or False? More info will allow me to assist you much better than before. Then I will alter my answer accordingly

Step-by-step explanation:

alexdok [17]3 years ago
7 0
Search it up on a calculator or on. google and you’ll get the right answer
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Answer:

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Step-by-step explanation:

done sorry

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Please help!!!! Will mark brainliest!! 18 points.
andreyandreev [35.5K]

Method 1:

You can use the formula of an area of equilateral triangle:

A=\dfrac{a^2\sqrt3}{4}

a - length of side

We have a = 10 yd. Substitute:

A=\dfrac{10^2\sqrt3}{4}=\dfrac{100\sqrt3}{4}=25\sqrt3\ yd^2\\\\\sqrt3\approx1.7\\\\A=25(1.7)=\boxed{42.5\ yd^2}


Method 2:

Use the Pythagorean theorem (look at he picture).

5^2+h^2=10^2

25+h^2=100           <em>subtract 25 from both sides</em>

h^2=75\to h=\sqrt{75}\\\\h=\sqrt{25\cdot3}\\\\h=\sqrt{25}\cdot\sqrt3\\\\h=5\sqrt3\ yd

The formula of an area of a trinagle:

A=\dfrac{1}{2}bh

b - base

h - height

We have b = 10 yd and h = 5√3 yd. Substitute:

A=\dfrac{1}{2}(10)(5\sqrt3)=(5)(5\sqrt3)=25\sqrt3\ yd\\\\\sqrt3\approx1.7\\\\A=25(1.7)=\boxed{42.5\ yd^2}

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