exam Maths Puzzle Numerical Ability

Can someone help me with the problem below, thanks.
Six distinct points lie on the circumference of a circle. How many inscribed quadrilaterals can be drawn having four of these points as vertices?
Thanks again.

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exam Other Question

Tom Quig traveled 280 miles east of St. Louis. For most of the trip he averaged 60 mph, but for one period of time he was slowed to 10 mph due to a major accident. If the total time of travel was 8 hours, how many miles did he drive at the reduced speed? The area of a parallelogram is 24.96 cm squared. The base is 6.4 cm. If the measures of the base and height are each doubles, find the area of the resulting parallelogram.