Answer:
10 cases
Explanation:
We are given the equation: y = -0.25x + 85, where y is the # of cases, and x is the # of students who received the vaccine.
The question asks for the # of cases if 300 students received the vaccine. Since we know that 300 students received the vaccine, we can plug that in for x in the equation above, since x is that unit:
y = -0.25(300) + 85
Now, we can solve:
y = 10
Therefore, there will be 10 cases if 300 students received the vaccine.