They're like terms. So it will be 7g as you plus the co-efficient together and you 7 and the g you add it to it.
Answer:
a) 
b) 
Step-by-step explanation:
Number of balls in the urn = 12
Number of white balls in the urn = 4
So, number of balls which are not white = 12 - 4 = 8
We know that probability = No. of outcomes/Total number of outcomes
Let
denotes the event of getting white ball by A, B and C
a) each ball is replaced after being drawn.
Probability = Number of white balls/Total number of balls
Solution: 
b)the balls that are withdrawn are not replaced.
Solution:
If A wins: 
If A lost and B wins: 
If A and B lost and C wins: 
and so on....
Answer:
because it never changes.
I think you are missing information to solve this problem. Should there me an image attached to this question.
Either way, to solve for the label, the label would most likely me a rectangle when laid flat.
It's dimensions would be length x height.
Where height is most likely "h"
and
length is most likely the circumference (2πr)
Thus the possible answers are either:
B or C
I can't answer it until I see an image when more detail.
Hope this helps!