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Intermediate Algebra Videos 25 videos
ACT Math Intermediate Algebra Drill 1, Problem 3. Can you find the value of a in this expression?
ACT Math Intermediate Algebra Drill 1, Problem 5. Can you simplify the expression?
ACT Math Intermediate Algebra Drill 2, Problem 1. Solve the equation.
ACT Math 3.1 Intermediate Algebra 1955 Views
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Description:
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
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...
Full Transcript
- 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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