Find the value of x, if 3⁴ × 3ˣ = 3⁸:

If x + (1/x) = 3, then the value of x³ + (1/x³) is :

If x + (1/y) = 1 and y + (1/z) = 1, then the value of z + (1/x) is

If 2ˣ × 3ʸ = 12 and 2ʸ × 3ˣ = 18, then the value of x + y is :

Find the value of: [(0.05)² + (0.41)² + (0.073)²] / [(0.005)² + (0.041)² + (0.0073)²]

If 2^(x−1) + 2^(x+1) = 1280, then the value of x²+9x is