Concept explainers
To find whether the number 19 is prime or composite.
Answer to Problem 27E
The number is prime.
Explanation of Solution
Given Information: Number 19.
Formula used: To check if the numbers is prime or composite ,find its factors. If its factors are more than 2(except 1 and the number itself), then the number is composite else prime.
Calculation:
To determine if 19 a prime number or a composite number, simply look at the factors for 19.
If the factors of 19 are only 19 and 1, then 19 is a prime number. Otherwise, 19 is a composite number.
The factors of 19 are as follows:
1, 19
Therefore, since 19is divisible by only one and itself, the number is prime.
Chapter 4 Solutions
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
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