Answer:
The answer is 49.
Explanation:
BRY line has a total angle measure of 180 to find BRG you just need to subtract GRY from BRY to find the measure of BRG then you can verify your answer by adding GRY and BRG (131 + 49 which equals 180).
49
131 + 7p = 180, solving for p we will end up with p = 7.
Now we know that the value of the angle GRB is 7p so we substitute the value instead of p so we will end up 7 * 7 = 49
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