Homework Help: Math 111

Posted by Joey on Thursday, September 29, 2011 at 11:33pm.

This is a question that deals specifically with WebWork.

Here is the question:
Write the set of points from -2 to 4 but excluding -1 and 4 as a union of intervals

my solution to this would be: [-2,4]U(-1,4)
my reasoning:
The first set includes -2 and goes up to and includes 4, the second includes everything greater than -1 and goes to everything less than 4. This way, the integer -2 is still included. BUT, this is wrong.

Math 111 - Steve, Friday, September 30, 2011 at 11:45am
If you had all the points, you'd have [-2,4]

But, you have to exclude 4, leaving [-2,4)

Now, inside this interval, you exclude -1, so you have to break it up into two intervals:

[-2,-1)U(-1,4)

Answer this Question

Related Questions

math - I do not know how to answer this question. Would someone please help me ...
English - Hello, everybody. I have a lot of point cards. For your activities, ...
Math!!! - I have an MSA math question. What scale would you use for making a ...
Math - Use sets to verify that 8>6. Here is how I answered this question...
Math - Use sets to verify that 8>6. Here is how I answered this question...
Math - Here is my question: Use counters to model the difference -2-5. Here is ...
calc 3 - Question Find an equation of the set of all points equidistant from ...
History - The article by Tom Watson and deals with the Negro Question in the New...
Math - The graph of the equation y=4-x consists of all the points in the ...
English - I need help bad, what exactly am I suppose to write about with this ...

For Further Reading

First Name:
School Subject:
Answer: