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Natasha_Volkova [10]
2 years ago
9

Someone please help me with the unanswered questions

Mathematics
2 answers:
Alex787 [66]2 years ago
7 0

Answer:

3) 87.9 or 1) 12.5

Step-by-step explanation:

they did multiply then subtract

e-lub [12.9K]2 years ago
5 0

Answer:

x equals: 15

Step-by-step explanation:

7x= 5x + 30

-5    -5

2x= 30 (divide by 2 on both sides)

x=15

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Use the Law of Sines to find the missing angle of the triangle.
Natasha2012 [34]

Answer:

m∠B = 70.0° (nearest tenth)

Step-by-step explanation:

<u>Sine Rule for Angles</u>

\sf \dfrac{\sin A}{a}=\dfrac{\sin B}{b}=\dfrac{\sin C}{c}

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Substituting the given values into the formula to find m∠C:

\implies \sf \dfrac{\sin 40^{\circ}}{13}=\dfrac{\sin C}{19}

\implies \sf \sin C=\dfrac{19\sin 40^{\circ}}{13}

\implies \sf C=\sin^{-1}\left(\dfrac{19\sin 40^{\circ}}{13}\right)

\implies \sf m \angle C=69.96086904^{\circ}

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\implies \sf m \angle A+ m \angle B+m \angle C=180^{\circ}

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2 years ago
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olga nikolaevna [1]

Answer:

In the pic

Step-by-step explanation:

If you have any questions about the way I solved it, don't hesitate to ask me in the comments below =)

6 0
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