Answer:
B, but I may be wrong.
Step-by-step explanation:
The Correct choice is :
C.) x <u>></u> 0
must be greater than 7
using pythagoras theorem
a^2=b^2-c^2
x^2=15^2-12^2
x^2=225-144
x^2=81
take square root both sides
√x^2=√81
x=9
and 9 is greater than 7
The essence of Mathematics lies in its freedom
