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What number is 40% of the way from -19 to -4?

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What number is 40% of the way from -19 to -4?

Apr 9th, 2015

-19 + 0.4*(-4 - (-19)) = -19 + 0.4*15 = -19 + 6 = -13.

Note that the distance between -19 and -4 is |-4 -(-19)| = 15 and the distance between -19 and -13 is 

|-13-(-19)| = 6 which is 6/15 = 0.4 = 40% of the first distance.

Answer: - 13. 

Apr 9th, 2015

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