12 × 12 = 144.

12 × 8 = 96.

12 ÷ (2 + 4) = 12 ÷ 6 = 2.

12 ÷ 4 = 3, then 3 × 3 = 9.

12% of 250 = (12/100) * 250 = 30.

15% of 200 = (15/100) * 200 = 30.

6 + 4 = 10, then 5 × 10 = 50.

5! = 5 × 4 × 3 × 2 × 1 = 120.

5! = 5 × 4 × 3 × 2 × 1 = 120.

7^2 = 49 and 3^2 = 9, so 49 + 9 = 58.

2 + 3 = 5, so 8 × 5 = 40.

According to BODMAS, 6 × 2 = 12, then 9 + 12 = 21.

Using BODMAS, 3 × 2 = 6, so 9 - 6 = 3.

9 × 9 = 81.

9^2 = 81 and 4^2 = 16, so 81 - 16 = 65.

cot(45°) = 1/tan(45°) = 1/1 = 1

cot(90°) = 1/tan(90°) = 1/0 = undefined.

Determinant of H = (3*5) - (2*1) = 15 - 2 = 13.

f''(x) = 24x - 12. At x = 1, f''(1) = 24(1) - 12 = 12.

The product of the roots is k = 2 * 4 = 8.

For no real roots, the discriminant must be less than zero: k² - 4*1*16 < 0, thus k < -8 or k > 8.

For no real roots, the discriminant must be less than zero: (-4)² - 4*1*k < 0, hence k > 4.

Since the roots are equal, k = 4 + 4 = 8.

sec(0°) = 1/cos(0°) = 1/1 = 1

sec(30°) = 1/cos(30°) = 1/(√3/2) = 2/√3 = √3

sec(45°) = 1/cos(45°) = 1/(√2/2) = √2.

sin(45°) = 1/√2

tan(0°) = 0

tan(90°) is undefined.

The 3rd term is C(5,2) * (3x)^3 * (-4)^2 = 10 * 27x^3 * 16 = -240.