Step-by-step explanation: Isolate the variable by dividing each side by factors that don't contain the variable.
The standard deviation is 1, I believe...
An example of the ratio 4:1 could be, in a school for every 4 girls there is 1 boy. Or something similar:)
Your answer would be 45 and 1/3
Through exterior angle theorem we now that...
x+13+63=3x
2x=76
x=38
m<CVU=3x=114 degrees