Answer:
Yes
Step-by-step explanation:
for pens you are adding 3 each time
for boxes you are adding 1 each time
it is correct because they all have the same unit rate
3/1=3
6/2=3
9/3=3
12/4=3
4(x+7)=8x-20
4x+28=8x-20
28=4x-20
48=4x
x=12
This is an example of a systematic sample.
Dr. Jon developed a system in order to get a random sample. His plan was to survey the 4th student that entered his classroom.
(4 times 4 times 5) + (5 times 10 times 8) = 480 in cubed.