Answer: 
Step-by-step explanation:
It is important to remember the following:

In this case you can observe in the figure that "x" is an Angle formed by two chords, therefore, you can find its value applying the formula.
Therefore, the value of "x" is this:

Do you have a picture to show, so that I can help?
Multiply numerator and denominator by the same number - 50/100.
Answer:
B. -4
Step-by-step explanation:
The function only has one y-value: -4. That is the entirety of its range.