Answer:

Step-by-step explanation:
circumference

Answer:
The first one is not a function
The second is a function
Third not a function
Fourth is a function
Step-by-step explanation:
Answer:
there are three significant numbers
Answer:
9x2−x4+y(x2+9)2x(x2+9)2
Step-by-step explanation:
2 lines intersect at one point and stop there to form an L shaped angle they also form a square when you combine another right angle and they measure 90 degrees. Hope this helps!