Explain why 15 isnt a prime number

cuz it is divisible by the numbers 3 and 5

Step-by-step explanation:

For 15 to be a prime number, it would have been required that 15 has only two divisors, i.e., itself and 1. However, 15 is a semiprime (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers. Indeed, 15 = 3 x 5, where 3 and 5 are both prime numbers.

Step-by-step explanation:

unpaid balance is : $149.99-$50 = $99.99 new balance = 149.99+2.62-50 = $102.61 finance charge = 99.99- 0.21/12= $1.75 new balance = 99.99+1.75 = $101.74 average daily balance method average daily balance= 3399.70/30 = $113.32 finance charge = $ 0.21/12ă—113.32 = $1.98 new balance = $149.99-50+1.98 = $101.97