ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Passport to Advanced Math Videos 52 videos
In the equation above, if a, b, and c are all constants, what is c?
When x = 12, a certain polynomial, y, equals 0. Which of the following must be true about the polynomial y?
SAT Math 1.5 Algebra and Functions. If f (x) = x2 - 16 and g(x) = x4 - 256, what is f of x divided by g of x?
SAT Math 4.3 Numbers and Operations 2174 Views
Share It!
Description:
SAT Math 4.3 Numbers and Operations
Transcript
- 00:02
Getting' Shmoopy with it...
- 00:04
If a and b are different prime numbers, which
- 00:06
of the following could also be prime?
- 00:08
And here are the potential answers...
- 00:13
The best way to deal with these questions
Full Transcript
- 00:15
is to substitute real prime numbers for the variables.
- 00:20
Let's say a = 2 and b = 3.
- 00:24
Now we can test each answer choice.
- 00:27
Choice A: 2 times 3 is 6. 6 is not prime. Boom -- gone.
- 00:32
Choice B: 2 cubed is 8. 8 isn't prime. Outta here.
- 00:37
Choice C: 2 plus 3 is 5. 5 is prime.
- 00:42
Choice D: 3 squared is 9. 9 isn't prime.
- 00:46
Only choice C can give us a prime number... ...so that's our answer.
- 00:57
An answer choice by any other letter would smell as sweet...
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...