The diagram shows 3 identical circles inside a rectangle. Each circle touches the other two circles and the sides of a rectangle,
as shown in the diagram.
The radius of each circle is 2 mm.​

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

Bring the fraction a/a-4 to a denominator of 16-a^2

Find the value of x to the nearest tenth.