Answer:
or 
Step-by-step explanation:
Given


Required
Find y

Substitute 


Collect like terms


Split the surd


Rationalize


Take LCM and add


or solve as:


Answer: it’s B
your welcome
Step-by-step explanation:
This is how you find the mean of a number:
To find the mean of a number, you need to add up all the numbers listed (so, 5, -11, 7, 12, -1 and 0) and then divide it by the amount of numbers there are listed. 5 + -11 + 7 + 12 + -1 + 0 equals 12, and since there are 6 numbers you then divide 12 by 6. 12 divided 6 is 2.
So the answer is A. I hope this helped you!
Answer:
Complementary angles are 90 degrees
Step-by-step explanation:
Supplementary angles are 180
Hope this helps:))))