Let y=-9 x+221 represent the number of students present in a large class, where x represents the number of hours of study required weekly. What is the rate of change of the number of students in the class with respect to the number of hours of study?
A) 9 students per hour of study time
B) -221 students per hour of study time
C) 221 students per hour of study time
D) -9 students per hour of study time

Question

Let  y=-9 x+221  represent the number of students present in a large class, where  x  represents the number of hours of study required weekly. What is the rate of change of the number of students in the class with respect to the number of hours of study?
A) 9 students per hour of study time
B)  -221  students per hour of study time
C) 221 students per hour of study time
D)  -9  students per hour of study time

Quizplus · Accepted Answer

The rate of change of the number of students with respect to the number of hours of study is represented by the coefficient of x in the equation, which is -9. This means for each additional hour of study required weekly, the number of students decreases by 9.

Let Y=-9 X+221 Represent the Number of Students