this is because the four is four hours and the n represents the 1 extra hour over the weekend.
b= i'm srry i don't know that one.
4+n=5 n=1 because if vernon plays 5 hours a week then 4+1=5 hours.
hope this : )
easy math just plug in a and b
a = 138
< RON = 90 since it is a right angle
RON is formed by 2 angles ROQ and QON
ROQ + QON = 90
48 + QON = 90
QON = 90-42
QON = 42
We know that QOP is a straight line
QOP = 180
QOP is formed by 2 angles QON and NOP
QON + NOP = 180
42+ NOP = 180
NOP = 180-42
a = NOP = 138