Explain how you can tell if the expressions 7x – 4 and 6x – 4 – x are equivalent.
1 answer:
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Answer:
38 degrees
Step-by-step explanation:
By the Law of Cosines,
5² = 3² + 7² - 2(3)(7) cos A
5² - 3² - 7² = -2(3)(7) cos A
-33 = -42 cos A
cos A = 33/42
A = arccos(33/42), which is about 38 degrees.
Answer:
63
Step-by-step explanation:
use tangent formula
