(a) Without using tables, find the value of $\frac{0.45\times 0.91}{0.0117}$
(b) Find the number which is exactly halfway between $1\frac{6}{7}$ and $2\frac{11}{28}$.
(c) If each interior angle of a regular polygon is five times the exterior angle, how many sides has the polygon?
(d) Calculate the volume of the material used in making a pipe 20cm long, with an internal diameter 6cm and external diameter 8cm. [Take $pi=\frac{22}{7}$].


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