The answer 56
Hope it helps

Sokka is here to help!!
Here's a explanation!
× 

Here's a paper I wrote of your answer.
Sorry, if my picture is blurry.
Hopefully, this helps you!!

Calculate Δ = b^2 -4ac => Δ = 169 => k1 = 3/2; k2 = -5 => 2k^2 + 7k - 15 = 2*(k -3/2)(k+5) = (2k - 3)(k+5);
Answer:
15.6 feet
Step-by-step explanation:
I have no time to explain