Please help me i am bad at math

c i am pretty sure

Step-by-step explanation:

C) 11.5 feet

Step-by-step explanation:

You would use the Pythagorean Theorem to find out the missing side.

The Pythagorean Theorem is: a^2 + b^2 = c^2

In order to find the missing side (b) you would do:

c^2 - a^2 = b^2

which when substituted for the side amount is:

13^2 - 6^2

or

169 - 36 = 133

now, all you have to do is find the square root of 133, which is 11.53

this means that the answer would be C) 11.5 feet

i hope this helps!! <3