Answer:
x=5
Step-by-step explanation:
add 5 to both sides
-20+5 = -3x
-15=-3x (divide)
x=5
Answer: Yes Rozonda's definition is valid
Step-by-step explanation:
Answer:
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7 will never equal 8 so there is no solution. so i think it is C
<h3>
Answer: 116.2°</h3>
Work Shown:

The first equation is one of the three variations for the Law of Cosines.
Make sure your calculator is in degree mode.