Yes you do , i learned pythagorean theorem last year in pre-algebra
80 degrees because it decreases by a half each time so by the time it is E (the fourth letter) it has gotten to 20 so the answer is 160
Answer:
x=5/6
Step-by-step explanation:
k=4/5
3 and 5 can go into 15
10/15 and 12/15
10/15 divided by x =12/15
x=5/6
Answer: Choice C. 
============================================
Explanation:
The domain is the set of all allowed x inputs.
Here we see that x = -3 is the smallest x value possible as it is from the left-most point. The graph goes on forever to the right, so there is no largest x value. Effectively infinity is the largest x value even though infinity is not a number.
We can say the domain is
which can be simplified to
or 
In short: x can be -3 or larger.