ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Algebra II Videos 54 videos
Mosquitos need their caffeine, just like the rest of us. Wouldn't think zipping around and stinging people all day long sap your energy?
SAT Math 1.5 Numbers and Operations 208 Views
Share It!
Description:
SAT Math 1.5 Numbers and Operations. How many dots would be in the 5 th term of this sequence?
Transcript
- 00:02
Here's an unshmoopy question you'll find on an exam somewhere in life...
- 00:06
These are the first three terms in a sequence.
- 00:09
How many dots would be in the 5th term of this sequence?
- 00:12
Here are the potential answers...
- 00:17
To solve this problem, we can either draw a ton of dots... or go the number route.
Full Transcript
- 00:23
First term: a column of 1, which means 1 dot total.
- 00:27
Second term: columns of 1, 3, 1, or 5 dots total.
- 00:32
Third term: columns of 1, 3, 5, 3, 1, or 13 dots total.
- 00:37
See the pattern yet?
- 00:40
Fourth term: columns of 1, 3, 5, 7, 5, 3, 1, or 25 dots total.
- 00:46
Fifth term: columns of 1, 3, 5, 7, 9, 7, 5, 3, 1...
- 00:51
When we add all the numbers, we get 41.
- 00:54
So the correct answer is (D).
- 00:55
As in, "Dot overload."
Related Videos
SAT Math 2.1 Geometry and Measurement. What is the measure of angle z in terms of x and y?
In 2014, the unemployment rate of one county in California was 7%. In another county, the unemployment rate was 11%. Which of the following express...
Angela is making cookies for a bake sale. She expects each batch of her cookies to sell for $40. It costs her $10 to make one batch of cookies, and...