A triangle has two sides with lengths 7m and 12 m. Which of the following lengths could represent the length of the third side?
Choose all that apply.

A) 4m
B) 7m
C) 10m
D) 17m
E) 19m

E 19m 7m+12m=19m

i think it's ф or x=6,-6

step-by-step explanation:

-x^2=-36

x^2=-36

ф

or

if you mean by : -(x^2)=-36

it'll be: x^2=36

x=6,x=-6

hope it'll ! have a good day!

you for asking!

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this