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2 years ago

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A total of 249 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student t

ickets sold was two times the number of adult tickets sold. How many adult tickets were sold?

1 answer:

inna [77]2 years ago

4 0

Answer:

83

Step-by-step explanation:

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ikadub [295]

<em>The right answer for:</em>

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<em>is:</em>

<em>-cos10°</em>

<h2>Explanation:</h2>

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$cos(-170^{\circ})=cos(170^{\circ})$

But:

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$cos(170^{\circ})=cos(180^{\circ}-10^{\circ})$

By property:

$cos(a-b)=cosacosb+sinasinb \\ \\ a=180^{\circ} \\ \\ b=10^{\circ} \\ \\ cos(170^{\circ} )=cos(180^{\circ} -10^{\circ})=cos180^{\circ} cos10^{\circ} +sin180^{\circ} sin10^{\circ} \\ \\ cos(170^{\circ})=-cos(10^{\circ})+0 \\ \\ \boxed{cos(170^{\circ})=-cos(10^{\circ})}$

<h2>Learn more:</h2>

Trigonometric functions: brainly.com/question/2680050

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