Hope I helped you. You didn't even asked any question.
Answer:
=46.27in
Step-by-step explanation:
SO YOU HAVE X(-14X+9). ALL YOU DO IS THE DISTRIBUTION PROPERY OR MULIPLE BY X
SO WE GET -14X^2+9X.
X(-14X+9)= -14X(*)X+9(*)X= -14X^2+9X
HOPE THIS HELPS
Choose whatever 2 points you want and you will always get the same slope. Calculate the rise and run.
Hoped this helped :)