Answer:
The answer is -(4/5)y - 3.
Step-by-step explanation:
The steps are :



To find the mean <span>Just add up all the numbers, then divide by how many numbers there are.
7 sets of numbers
the sum of all numbers is 105
105 </span>÷ 7 = 15
so the mean of the years is 15
Percent means parts out of 100
80%=80/100=8/10=4/5
<span>21 1/3 children will be served with the amount of 4 gallons of cider.</span>