What do you mean? Oh oh oh I used to do this, what grade you it?
Answer: A: the possible income from producing an additional item.
Step-by-step explanation: The actual definition of marginal cost is the cost added by producing one additional unit of a product of service.
5 girls : 4 boys
5 + 4 = 9 students
= 27 students ( 5girls / 9 students )
*cancel students units*
= 27 ( 5 girls / 9)
= 15 girls
Mistake in Line 2 : Was in the determining the values for a ,b,c
Mistake in Line 4 : Not taking the square roots of both sides.
Step-by-step explanation:

First Mistake : Line 2

Second Mistake : Line 4

Correct Solution :

