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ACT Math 3.1 Intermediate Algebra 1954 Views


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Description:

ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.

Language:
English Language

Transcript

00:04

Time for your daily dose of shmoop...Open wide!

00:07

Find the 5th number in this series: 0, -1, -3, -7...

00:13

And here are the potential answers...

00:16

OK so what is this question asking?

00:18

Well, there's clearly a pattern we're being asked to observe...

00:22

And here, we get exponentially more negative as we go along. Sorta like this guy.

00:27

We are just being asked to find the number that comes after negative 7 and we're travelling

00:34

left from 0 in steps of 1, 2, then 4...

00:40

The pattern is "2 times... something..." Looks like 2 times the previous number, then

00:46

minus 1...

00:46

...so if we keep going, we're at minus 7 times 2 which is minus 14...

00:52

...then subtract 1 and we have minus 15.

00:56

Answer A

00:57

Hopefully you got that right. We don't want to take any chances at upsetting Mr. Black.

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