Find the missing number to make the average correct. The average of 11, 17, 18, and ? is 17.
1 answer:
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For this case we have to define trigonometric relations of rectangular triangles that:
- The cosine of an angle is given by the leg adjacent to the angle on the hypotenuse of the triangle.
- The sine of an angle is given by the leg opposite the angle on the hypotenuse of the triangle.
Then, according to the figure we have:
Answer:
Option D
With some simple rearrangement, we can rewrite the numerator as
Then factorizing the difference of squares, , we end up with
Answer:
Step-by-step explanation:
