In 2015, there were about 22 million teenagers (aged 13–17) in the United States. They each sent an average of 900 text messages
1 answer:
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Answer:
The expected number of minutes the rat will be trapped in the maze is 21 minutes.
Step-by-step explanation:
The rat has two directions to leave the maze.
The probability of selecting any of the two directions is, .
If the rat selects the right direction, the rat will return to the starting point after 3 minutes.
If the rat selects the left direction then the rat will leave the maze with probability after 2 minutes. And with probability
the rat will return to the starting point after 5 minutes of wandering.
Let <em>X</em> = number of minutes the rat will be trapped in the maze.
Compute the expected value of <em>X</em> as follows:
Thus, the expected number of minutes the rat will be trapped in the maze is 21 minutes.
Answer:
The graphs of the equations intersect at x=2
Step-by-step explanation:
we have
----> equation A
----> equation B
Solve the system by graphing
Remember that the solution of the system of equations is the intersection point both lines
Using a graphing tool
The solution is the point (2,-2)
see the attached figure
therefore
The graphs of the equations intersect at x=2
