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

The weight of a day-old chick was measured to be 0.21g. If the actual weight of the chick is 0.18g, what was the percentage error in the measurement?

Evaluate \((\frac{6}{0.32} \div \frac{2}{0.084})^{-1}\) correct to 1 decimal place.

If 2\(^{x + y}\) = 16 and 4\(^{x - y} = \frac{1}{32}\), find the values of x and y.

Simplify \(\frac{0.0839 \times 6.381}{5.44}\) to 2 significant figures.