Answer:
13 is c
Step-by-step explanation:
to find the length of a diagonal, pretend as if you are finding the hypotenuse of a triangle.
5^2 + 12^2 = c^2
25 + 144 = 169
the square root of 169 is 13
Since is addition you do the opposite and subtract 12 from 12 and -5 then 12 cancels out and -5-12=-17
Answer:
7..the way you worded the options was confusing
D is the answer
(4+8)+1 = 13
4+(8+1) = 13
Therefore equation D is true
