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3 years ago

I'm a little stuck xD

Mathematics

2 answers:

Semmy [17]3 years ago

4 0

There are 180 degrees in a triangle when you add the measures of the angles together. So...
102 + 39 + x = 180
141 + x = 180
x = 39

kap26 [50]3 years ago

3 0

It's 39 because a triangle adds up to 180. so you can add 39 and 102 and get 141 and subtract that from 180, getting 39. the missing angle

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Step-by-step explanation:

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Let $\cos x =y$

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$y = \frac{1+3}{4}$ and $y = \frac{1 -3}{4}$

Simplify:

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$\cos x = 1$

⇒ $x = 0^{\circ}$

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⇒ $x = 120^{\circ} \text{and} x = 240^{\circ}$

The solution set: $\{0^{\circ}, 120^{\circ} , 240^{\circ}\}$

Therefore, the solution for the given equation $2\cos^2x -\cos x -1 =0$ is, $0^{\circ}$

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<h3>What are word problems?</h3>

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From the given information, it was stated that:

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brainly.com/question/21405634

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