15 =3x5

25=5 squared
30=2x3x5

You've provided three different arithmetic expressions involving multiplication and exponentiation:

1. 15 = 3 x 5
This is stating that the product of 3 and 5 is equal to 15, which is correct.

2. 25 = 5 squared
This is stating that 5 squared, which means 5 multiplied by itself, equals 25. This is also correct, as 5 x 5 = 25.

3. 30 = 2 x 3 x 5
This expression breaks down the number 30 into its prime factors. 30 is indeed the product of the prime numbers 2, 3, and 5. Hence, this statement is also correct.