Work out the lengths of sides a and b give your answers to 1 decimal place

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

The random variable x is defined as the number marking the sector in which the arrow lands when the spinner in the diagram is spun once.

Which two angles in the figure are adjacent angles?