When two lines intersect to form a 90 degree angle, these lines are called perpendicular lines.
Let

be the amount of parts the student answered correctly. Suppose that

is a function between

and the score of a student's project. As the student initially receives a fixed

points for turning the project in and

points for each correct part, the function is initially:

When the students receive

points for each correct part, the coefficient of

changes, as the amount of points received per correct answer increases. Thus:

.
I hope this helps you
18=3^2.2
18=2.9
18=6.3