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Helen [10]
3 years ago
15

I will give Brainiest if your right

Mathematics
1 answer:
Setler79 [48]3 years ago
5 0

Answer:

I'm always right B-) SHEESH

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Solve by factoring: x2 – 9x + 20 = 0
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Answer

Given equation is:

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−5x−4x+20=0

⇒(x−4)(x−5)=0

⇒x=4andx=5

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PYTHAGORAS THEROM AND TRIGONOMETRY RATIO​
marysya [2.9K]

Answer:

1) ΔACD is a right triangle at C

=> sin 32° = AC/15

⇔ AC = sin 32°.15 ≈ 7.9 (cm)

2) ΔABC is a right triangle at C, using Pythagoras theorem, we have:

AB² = AC² + BC²

⇔ AB² = 7.9² + 9.7² = 156.5

⇒ AB = 12.5 (cm)

3)  ΔABC is a right triangle at C

=> sin ∠BAC = BC/AB

⇔ sin ∠BAC = 9.7/12.5 = 0.776

⇒ ∠BAC ≈ 50.9°

4) ΔACD is a right triangle at C

=> cos 32° = CD/15

⇔ CD = cos32°.15

⇒ CD ≈ 12.72 (cm)

Step-by-step explanation:

7 0
3 years ago
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