we know that
the area of the rectangular banner is equal to

where
W is the wide of the banner
h is the height of the banner
in this problem


In the formula of the area solve for h

Substitute the values of W and A

therefore
the answer is
the height of the banner is 
Your answer is D) 9.
This is because the slope of any line in the form y = mx + c is represented by the multiplier of x, which in this case is 9.
I hope this helps!
Biggest is all nine's
smallest is 1 then zeroes
greatest
999999
smallest
10000