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seropon [69]
3 years ago
14

Evaluate for given replacement

Mathematics
1 answer:
jasenka [17]3 years ago
4 0
First, plug in 7 for m

|6 - 2(7)|
|6 - 14|
|-8|
since it's an absolute value, the answer will be positive
answer: 8
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Given: △ABC; AB=BC, m∠BDA = 60°, BD=4 cm, BD ⊥ BA . Find: DC, AC.
vekshin1

Answer:

DC = 10.93 cm ,  AC = 9.8 cm

Step-by-step explanation:

From trigonometry;

⇒ Tan 60 = AB/BD

⇒AB = BD Tan 60 ( where BD = 4 cm )

⇒ AB = 6.93 cm

Also, AB=BC , therefore;

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⇒ Cos 60 = BD/AD

⇒ AD = BD/ Cos 60 = 4/Cos 60

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⇒ AC^{2} = AB^{2} + BC^{2} = (6.93)^{2} + (6.93)^{2}

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4. Is the point (3,-4) a solution to the given system? Justify your answer.
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==========================================================

Explanation:

The point (3,-4) means that x = 3 and y = -4 pair up together

Let's plug these x,y values into each equation

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Repeat for the second equation

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