Answer:
1/3
Step-by-step explanation:
There are 6 sides on a dice. These are two of the possibilities. 2/6 is the same as 1/3.
The correct answer is the first option.
If you want to use elimination, you can sum the two equations for example, so that the x's simplify:



Plug this value for y in one of the equations to derive the value of x:

So, the solution is 
The starting percent is 100%. After one hour, bacteria tripled, so it is 300%.
Answer:
12.56 (13 if rounded)
Step-by-step explanation:
A=pi x r squared
A=2 squared multiplied by pi
A=4 times pi
plug into calculator should be about 12.56