Well first all you have to do is simplifying both sides of the equation then of course isolating the variable then you should end up with

Hopefully this helps ^0^ Mark Brain
Answer: (c)
Step-by-step explanation:
In the given figure, two triangles are similar namely
and 
For similar triangles, the ratio of the corresponding sides are equal.
For option (a), Hypotenuse to Perpendicular ratio is given, that is correct
Similarly for option (b), Perpendicular to hypotenuse ratio is given
Both option (a) and (b) gives the same value of
that is,

Option (c) does not give the correct value of 
Answer: 9 because of the (0,9)
Step-by-step explanation:
the answer issssssssssss A
No the sum is -21 is bigger than 12 because