Answer: C) All real values of x such that 
In other words, x must be 0 or smaller.
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Explanation:
The reason why is because we must make the stuff under the square root to never be negative. We must make -2x be 0 or larger.
So,

As an example, if x = -2, then -2x = -2(-2) = 4 is positive. Applying the square root to a positive number is valid.
But if x = 5, then -2x = -2*5 = -10 is under the square root, which is not allowed.
Answer:

Step-by-step explanation:
Given



Orchestral =
of music practice time
Required
Determine time spent on orchestral pieces
From the given parameters, we have:
Orchestral =
of music practice time
Substitute
for music practice time.
So, we have:



Answer:
b and e
Step-by-step explanation:
You would want to add all of the angles together to find the sum. Set this equal to 360.
2x-9 + 2x-9 + x + x + x = 360
Combine like terms,
7x-18 = 360
Add 18 to both sides,
7x = 378
Divvied both sides by 7,
x = 54