How do you find the GCF of 9 and 15 and 24?
GCF = 3
The GCF is the highest number that is a factor of all three of our "test subject numbers".
So let's do a prime factorization of all three to start things out and I'll colour the different prime values in different colours:
Ok, now let's find what is common.
2
There are 2s in 24 but not in 9 or 15, so there are no 2s in our GCF.
3
There is one 3 in 24 and in 15 and two in 9  so one 3 is common to all three numbers.
5
There is a 5 in 15 but not in 9 or 24, so the GCF doesn't have a 5.
And there are no more prime numbers.
This means our GCF = 3.
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To find the greatest common factor (GCF) of 9, 15, and 24, you can use the method of prime factorization.

Find the prime factors of each number:
 9 = 3^2
 15 = 3 * 5
 24 = 2^3 * 3

Identify the common prime factors and their lowest exponents:
 The common prime factor is 3, which appears in all three numbers.
 The lowest exponent of 3 is 1.

Multiply the common prime factor(s) with their lowest exponents to find the GCF: GCF(9, 15, 24) = 3^1 = 3
Therefore, the greatest common factor of 9, 15, and 24 is 3.
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When evaluating a onesided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a onesided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a onesided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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