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Mathematics 20 Online
OpenStudy (anonymous):

EF is a median of trapezoid ABCD. What is the value of x?

OpenStudy (anonymous):

|dw:1364518789106:dw|

OpenStudy (mertsj):

Add the two bases and divide by 2. That will give you the median

OpenStudy (anonymous):

can you help me do that?

OpenStudy (anonymous):

@Mertsj

OpenStudy (mertsj):

What are the bases?

OpenStudy (anonymous):

4x-10 and 3x+8?

OpenStudy (anonymous):

@Mertsj

OpenStudy (mertsj):

Add those together.

OpenStudy (mertsj):

Add the two bases

OpenStudy (anonymous):

so its 7x-2 ? @Mertsj

OpenStudy (mertsj):

yes

OpenStudy (anonymous):

but how do you divide that by 13?

OpenStudy (mertsj):

Add the two bases and divide by 2.

OpenStudy (anonymous):

.....

OpenStudy (anonymous):

...

OpenStudy (anonymous):

I thought you have to devide by the median? @Mertsj

OpenStudy (mertsj):

Well I posted earlier that you should add the 2 bases and divide by 2 and that would be the median. That is true. Do you believe it?

OpenStudy (mertsj):

Add the two bases and divide by 2. That will give you the median

OpenStudy (anonymous):

but i am looking for x

OpenStudy (mertsj):

So write: \[\frac{7x-2}{2}=13\]

OpenStudy (mertsj):

And solve that equation.

OpenStudy (mertsj):

That will give you x

OpenStudy (anonymous):

can you just help me i don't know how to do that iether

OpenStudy (anonymous):

@Mertsj

OpenStudy (mertsj):

Multiply both sides by 2

OpenStudy (mertsj):

1. Multiply both sides by 2 2. Add 2 to both sides 3. Divide both sides by 7

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