Answer:
c. 
Step-by-step explanation:
When plugging in zero into the given equation:

Answer is in indeterminate form = use L'Hospital's Rule:
(Derivative of the top / Derivative of the bottom)

Rearranged equation:

Plug zero back into equation:

Answer:

60/48
Both can be reduced by 12 to 5/4
So you can have 12 groups with 5 6th graders and 4 7th graders
Answer:
D is correct
Step-by-step explanation:
A graph of that sort will make a perfectly mirrored "V" shape, and with no offset, the bottom point will be on the y axis. This means that the first equation will intercept the y axis at zero, the second will intercept the y-axis at -15.
"A" may seem correct also, as the second graph will intercept the x-axis at -15, but it is not complete, as it will intercept that axis at +15 as well.
The mean and median can be calculated for quantitative data only.