Subtract 2 from both sides to get 5x = 15, then divide by 5 to find x = 3.

All options result in even numbers when an even number is used.

An even number is defined as being divisible by 2.

The square of an odd number is always odd.

Setting f(x) = 0 gives x^2 - 4 = 0, so x = ±2.

Substituting n = 4 gives a_4 = 3(4) + 1 = 12 + 1 = 13.

a_5 = 3(5) + 1 = 15 + 1 = 16.

Both n + 1 and n - 1 are even, and 2n is always even.

7 divided by 3 gives a remainder of 1.

The common difference is 3. The 5th term is 2 + 4*3 = 14.

The common difference is 4; thus, the 5th term is 3 + 4*4 = 19.

The GCD of 12 and 15 is 3, as it is the largest number that divides both.

The product of the roots is given by c/a = 6/1 = 6.

25 divided by 4 gives a quotient of 6 and a remainder of 1.

37 divided by 5 gives a quotient of 7 and a remainder of 2.

The sum is 1 + 2 + 3 + 4 + 5 = 15.

10 divided by 3 gives a remainder of 1.

2x = 2 * 4 = 8.

3^2 = 9 and 4^2 = 16, so 9 + 16 = 25.

3^3 = 3 * 3 * 3 = 27.

5! = 5 * 4 * 3 * 2 * 1 = 120.

7 divided by 4 gives a remainder of 3.

Adding 4 to both sides gives 2x = 14, so x = 14/2 = 7.

6 is a factor of 36 since 36 ÷ 6 = 6.

The equation factors to (x - 2)(x + 2) = 0, giving solutions x = -2 and x = 2.

Factoring gives (x-2)(x-3)=0, so x=2 or x=3.

8 is an even integer as it is divisible by 2.

11 is only divisible by 1 and itself, making it prime.