A= 12.8m
B=13.9m
C=12m
D= 7m

C: 12m

Step-by-step explanation:

We can solve this by using the Pythagorean Theorem

For this triangle

a= x   b= 5   c= 13

We now have the equation

If we simplify this we get

Next, we subtract 25 from both sides

Finally, if we take the square root of both sides of the equation, we find that

x= 12

it's both, now can you answer my most recent question?

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.