ACT Math 3.1 Intermediate Algebra
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
| ACT | ACT Mathematics |
| ACT Mathematics | Intermediate Algebra |
| Algebra | Sequences and Series |
| Foreign Language | Arabic Subtitled Chinese Subtitled Korean Subtitled Spanish Subtitled |
| Intermediate Algebra | Sequences |
| Language | English Language |
| Product Type | ACT Math |
| Rhetorical Skills | Organization: Sentences and Paragraphs |
Transcript
And here, we get exponentially more negative as we go along. Sorta like this guy.
We are just being asked to find the number that comes after negative 7 and we're travelling
left from 0 in steps of 1, 2, then 4...
The pattern is "2 times... something..." Looks like 2 times the previous number, then
minus 1...
...so if we keep going, we're at minus 7 times 2 which is minus 14...
...then subtract 1 and we have minus 15.
Answer A
Hopefully you got that right. We don't want to take any chances at upsetting Mr. Black.