ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Intermediate Algebra Videos 25 videos
ACT Math Intermediate Algebra Drill 1, Problem 1. What is the product of (a – 3)2?
ACT Math Intermediate Algebra Drill 1, Problem 2. Find the product of (2a + 6)2.
ACT Math Intermediate Algebra Drill 1, Problem 3. Can you find the value of a in this expression?
ACT Math 3.1 Intermediate Algebra 1955 Views
Share It!
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.
Related Videos
ACT Math: Coordinate Geometry Drill 1, Problem 1. Which inequality is expressed by the number line?
ACT English: Punctuation Drill 1, Problem 3. Is that comma being used correctly?
We don't like knocking people down to size, but we do like simplifying radicals. Join us?
If fleeing criminals always fled the scene of the crime at perfect right angles, it would be much easier to determine their whereabouts. Fortunatel...
