Substituting x = 2: 3(2) + 5 = 6 + 5 = 11.

Calculating gives 3^3 = 27 and 4^2 = 16. Therefore, 27 + 16 = 43.

Calculating 3^3 gives 27 and 2^3 gives 8. Therefore, 27 - 8 = 19.

3^3 = 3 × 3 × 3 = 27.

Calculating gives 4 × 5 - 5 = 20 - 5 = 15.

According to the order of operations, we first perform the multiplication: 2 × 3 = 6. Then we add: 5 + 6 = 11.

5! = 5 × 4 × 3 × 2 × 1 = 120.

5! = 120, 3! = 6, and 2! = 2. Thus, 120 / (6 * 2) = 10.

First, calculate inside the parentheses: 2 + 3 = 5. Then, 5 × 5 - 4 = 25 - 4 = 21.

5(3 + 2) - 4 = 5 × 5 - 4 = 25 - 4 = 21.

According to the order of operations, we first calculate 3 × 2 = 6, then add 7, giving 7 + 6 = 13.

The square root of 144 is 12, since 12 * 12 = 144.

The term containing x^4 is given by C(6, 4)(3x)^4(4)^2 = 15 * 81 * 16 = 19440.

Subtracting 3 from both sides gives 2x = 12. Dividing by 2 gives x = 6.

Subtracting 5 from both sides gives 3x = 15. Dividing by 3 gives x = 5.

Rearranging gives 3x - 2x = 5 + 7, thus x = 12.

A matrix is singular if its determinant is zero. Det(A) = (x*4) - (2*3) = 4x - 6 = 0. Solving gives x = 1.5.

Subtracting 4 from both sides gives 2x = 12. Dividing by 2 gives x = 6.

Subtracting 7 from both sides gives 3x = 15. Dividing by 3 gives x = 5.

Adding 7 to both sides gives 3x = 9. Dividing by 3 gives x = 3.

Rearranging gives 3x - 2x = 5 + 7, thus x = 12.

Expanding both sides gives 4x - 8 = 3x + 3. Subtract 3x from both sides: x - 8 = 3. Adding 8 gives x = 11.

Solving for x gives 4x = 16, thus x = 4.

Add 5 to both sides: 4x = 16. Then divide by 4: x = 4.

Adding 7 to both sides gives 4x = 16. Dividing by 4 gives x = 4.

Adding 3 to both sides gives 5x = 5. Dividing by 5 gives x = 1.

The modulus |z| = √((-1)² + (-1)²) = √(1 + 1) = √2.

|−8| = 8 and |−3| = 3, so 8 + 3 = 11.

The value of π (pi) is approximately 3.14.

√(144) = 12 and √(64) = 8, so 12 + 8 = 20.