I assume you mean divide using the conjugate to rationalize the denominator and express the result in standard rectangular form.

Answer:
O= 90 because it is a right angle, 360 degrees (which is the whole circle) minus (50+90), equals 220.
Answer: no
Step-by-step explanation: no
Answer: I need points to give out for answers-
Step-by-step explanation:
Answer:
cos = adjacent/hypotenuse
3/square root13
now you do square root 13 x3 divided by square root 13^2
= 3square root13/13
hope that answers your question