Answer:
You would usually use 3.14
Step-by-step explanation:
It kind of depends on where you are using it. In an equation, pi would be used as 3.14 and the answer would be approximated. To write it anywhere else (I dont know where else you would though), you would do the pi symbol. I hope this helps.
Answer:
Step-by-step explanation:
Given

comparing it with standard equation 
so 4a=1

so Focus of parabola is (0,0)
directrix
y=-a
here 
Answer:
-1/4
Step-by-step explanation:
2-1 over -3-1 = 1/-4
Answer:
1
Step-by-step explanation: i am not sure
Answer:
31
Step-by-step explanation:
5*6+1
30+1
31