
Concept explainers
To find whether the number 84 is prime or composite.

Answer to Problem 30E
The number is composite.
Explanation of Solution
Given Information: Number 84.
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 84 a prime number or a composite number, simply look at the factors for 84.
If the factors of 84 are only 84 and 1, then 84 is a prime number. Otherwise, 84 is a composite number.
The factors of 84 are as follows:
1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84
Therefore, since 84 is divisible by more than one and itself, the number is composite.
Chapter 4 Solutions
ELEMENTARY+INTERMEDIATE ALGEBRA
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