If the third term in an arithmetic sequence is 7 and the common difference is -5, what is the value of the fourth termA.12B.2C.-
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Hey there!
The answer is √20 or approximately 4.47
We can use the Pythagoreon Theorem, which is .
and
are the names of the two sides, and
is the name of the hypotenuse leg, or the longest side. We will plug the numbers into the formula, and solve:
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