The simple interest on ₦8550 for 3 years at x% per annum is ₦4890. Calculate the value of x to the nearest whole number.

Simplify 81\(^{\frac{-3}{4}}\) x 25\(^{\frac{1}{2}}\) x 243\(^{\frac{2}{5}}\)

Find the value of \(\frac{(0.5436)^3}{0.017 \times 0.219}\) to 3 significant figures.

If S = (4t + 3)(t - 2), find ds/dt when t = 5 secs.

The angles of a polygon are given by 2x, 5x, x and 4x respectively. The value of x is