Well I'm still trying to solve the first question so I'll tell you the other answers
the answer for the second question is :

and for the third question :
You are right i tried it and i got it right
Without the table I will guess 5 is common to all 3 they are proportional
I think the answer is x>-3
C. 100/20
This is because the formula to finding speed is distance divided by time.