10.9544511501If rounded, it would be 10.95
3/7+1/7
The denominator is the same so you only have to add the numerator
The answer to your question is 4/7
By the external angle theorem
5x = (5x - 30) + m < RST
m < RST = 5x - 5x + 30 = 30
also m < STR = m < SRT = 5x - 30
So as there are 180 degrees in a triangle:-
5x - 30 + 5x - 30 + 30 = 180
10x = 180 +30+30-30 = 210
x = 21 answer