Answer: 
Step-by-step explanation:
For this exercise you need to remember the following Trigonometric Identity:

You must observe the figure given in the exercise.
You can notice that the given triangle EFG is a Right triangle (Right triangles are defined as those triangles that have an angle that measures 90 degrees).
So, you can identify in the figure that:
So, knowing these values, you can substitute them into
and then you must evaluate (Remember to round the result to the nearest hundreth).
Therefore, through this procedure you get:

Argon because when you compare the place values, 0.78 which is the amount of nitrogen and 0.93, the amount of argon in air. 0. Is the same so move to the next number, 0.7 and 0.9. 9 is the largest number so 0.93, ( Argon) is more
Answer:
yeah your teeth is good and strong too
Sounds to me like it would be 27.7 the way you have it worded