Glen wants to improve his grade in history class after failing an exam. he decides to study an extra 2 hours before his next exam, and his grade improves by 9%. what is the unit rate for this situation?

d) 9
d) 2
d) 1
d) 4.5

the answer is c. hope this !

step-by-step explanation:

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: