Answer:
x = 3/2 or x = -4
Step-by-step explanation:
The identifiable error the students have is that before the left hand side of the equation is factorized, the right hand side value of 12 ought to be brought to the left hand side, leaving a net value of zero on the right hand side. Then whatever is factored on the left hand side is then equated to zero and then we can find the two values of x after setting each of the individual factors to zero
We proceed as follows;

Total cost = Price of juice + price of chocolate + tax = 10 + 10 + [(16/100) x 20]
= 20 + 3.2
= $23.2
45 cookies will serve 15 students.
You would multiply 15 by 2 that would give you 30, therefore you multiply 45 by 2 which will be 90.
90 cookies will serve 30 students
2 , 4 the last one will be 28
It would either be 21 or 25 as they both have the same amount of factors :)