Question

explain why 15 into 7 + 7 is a composite number

Answer 1

15x7 + 7= 7 (15×1+1)= 7 (3×5×1+1)
Since it is expressed as a product of primes it is a composite number

Answer 2

Answer:

The number $15\times (7+7)$ is a composite number.

Step-by-step explanation:

Composite number: A non prime number is called a composite number. In other words a number is a composite number if it is divisible by any number other than one and itself.

The given number is

$15\times (7+7)$

Simplify the bracket.

$15\times 14$

$210$

The factors of 210 are 1,2,3,5,7,10,21,30,42,70,105,210.

Since 210 is divisible by many numbers, therefore $15\times (7+7)$ is a composite number.