Answer:
b
Step-by-step explanation:
R = 10a - 20
ur revenue totaled 110...so R = 110
110 = 10a - 20
110 + 20 = 10a
130 = 10a
130/10 = a
13 = a <== so u spent $13 on advertising
What makes me happy irl is nothing really, I only exist to make others happy
The answer is 5.196152423
Since - x^2=27
X=square root of 27
=5.196152423