What is the arithmetic mean of 8², 9², 10², …, 15²?

If x varies as yz, then y varies inversely as

If the area of a square is 2401x⁴ + 196x² + 4, then what is…

If f(x) is divided by (x – α)(x – β) where α ≠ β, then…

If logₓ = 1·2500 and y = xlogₓ x, then what is logᵧ equal to?

If x = √2, y = ³√3 and z = ⁶√6, then which one of…