Answer:
They changed 5m into a positive when it should've stayed as a negative until you isolate the variable m at the end, making m actually equal -7.
Step-by-step explanation:
-5m - 16 = 19
-5m = 19 + 16
-5m = 35
m = 35/-5
m = -7
m=-7
Is -7 because,
-5(-7)-16=19
-5*-7-16
35-16=19
the second option
the SSS congruence postulate would be used
i can only say that you should use this forumla, the sins law
sin(a)/A = sin(b)/B = sin(c)/C
