6. the figure shows a circle, centre o. ac is a tangent
to the circle at a and obc is a straight line.
given that ac = 18 cm and bc = 12 cm, find
(1) the radius of the circle,
(ii) angle aob
(iii) the area of the shaded region.

2(n-1)+4n=2(3n-1)n=0no solutioninfinitely many solutions n= - 4 !

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable