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September 21, 2014

September 21, 2014

Posted by **lindsay** on Saturday, April 6, 2013 at 9:21pm.

- math -
**Ollie**, Saturday, April 6, 2013 at 9:59pmLet d be the difference between terms.

Let x be the first term.

The second term will be x + d.

The third term will be x + 2d.

Fourth term will be x + 3d.

But the fourth term is 20, so x + 3d = 20.

Continue this until you get the eighth term.

Write an equation about the eighth term.

Now you have two equations with two unknowns which you can solve to find both the first term and the difference.

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