Answer:
Step-by-step explanation: 85 students and 80 adults
4x+y=9
4(2)+(1)=9
8+1=9
9=9
It is a solution
8.778 or 8.8
Step-by-step explanation:
20% of 43.89 is 8.778
math: 43.89*(20/100) = 8.778