Answer:
25−5v2
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ask your teacher.
use a calculator.
Use math tutoring for this module.
Pay more attention to the lecture.
Answer:
A. 8
Step-by-step explanation:
The angle shown is a 90 degree right angle (shown by the box where the vertex is)
We see that the first angle inside the right angle is 50 degrees, so the other angle must be 40 because the degrees must add up. We can set up an equation here.

After dividing both sides by 5, we get x = 8
Answer is C.
Multiply the numerator and denominate by 3 - √5
Hope it helps.
The answer is B, you should really learn how to calculate these yourself though because they come up a lot.