The a is 11
g(4)=20+a
g(4)=31
31-20=11
a=11
21x-9+63=180
21x+54=180
21x=126
x=6
Answer:
either 81 or 81.8
Step-by-step explanation:
I would go with then answer 168
Because if 12 of 180 has spots then you would subtract 12 to get how many will not have spots ....thats how I got the answer
Hope I helped Pls mark me as brainliest