 A survey was conducted among 100 boys and 60 girls to determine how many of them watched TV in the period during which examinations were written. Their responses are shown in the partially completed table below.
 The digits 1 to 7 are used to create a fourdigit code to enter a locked room. How many different codes are possible if the digits may not be repeated and the code must be an even number bigger than 5000?
 Solve for x:
 The following geometric sequence is given: 10; 5; 2,5; 1,25; ...
 Consider the series: S_{n} = 3 + 5 + 13 + 21 + ... to n terms.
 Given: f(x) = 2^{x + 1}  8
 Given: h(x) = 2x  3 for 2 ≤ x ≤ 4. The xintercept of h is Q

The graphs of f(x) = 2x^{2} and g(x) = ax^{2} + bx + c are sketched below.
Points P and Q are the yintercepts of f. Points Q and R are the xintercepts of g. S is the turning point f g. T is the yintercept of both f and g.
 The graph of f shows the book value of a vehicle x years after the time Joe bought it. The graph of g shows the cost price of a similar new vehicle x years later.
 If f(x) = x^{2}  3x, determine f `(x) from first principles.