Answer:
x+y=52
3x=2y+36
_____
x=-y+52
-3y+156=2y+36
5y=120
y=24
52-24=30
30 guys in the class
Answer: False
Step-by-step explanation:
degrees of freedom=(r-1)(c-1)
I don't know if I'm exactly right
if not sorry
4
4 : 1, 2,4
12 :1, 2, 3, 4, 6, 12
Hope this will help ya :S
Answer: a
Step-by-step explanation: look at the chart
