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Viefleur [7K]
3 years ago
5

4. Which trigonometric expression is equal to cos 72°? A. cos 55° B. cos 50° C. sin 61° D. sin 18°​

Mathematics
1 answer:
Yanka [14]3 years ago
8 0

Answer:

D.  sin 18°

Step-by-step explanation:

sin 18 because 18 + 72 = 90

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Answer:

The number of adult tickets sold was 121

Step-by-step explanation:

The general equation is: <em>S</em> + <em>A</em> = <em>T</em>    ;where <em>S</em> means student tickets, <em>A</em> means adult tickets and <em>T</em> means total tickets. We know that <em>S</em> is two times <em>A</em> and <em>T</em> is 363. So, <em>S</em> will be 2x and A will be x. Then, the new equation is 2x + x = 363.

<em>S</em> + <em>A</em> = <em>T</em>  

2x + x = 363  

3x = 363  

x = 363 / 3

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Student tickets: <em>S</em> = 2x = 2 * 121 = 242

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artcher [175]

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