Higher Plus
5th March 1968
- 1Proof of the Circle Theorems2 marks
In a circle theorem proof, a step uses the fact that OA and OB are both radii of the circle, so triangle OAB is isosceles. State the reason being quoted.
- 2Probability Equation Questions3 marks
A bag holds 5 counters, r of them red. Two are taken without replacement and P(both red) = 1/10. Work out r.
- 3Histograms3 marks
A histogram has two bars: one 5 units wide with frequency density 1.5, one 25 units wide with density 0.8. How many values in total?
- 4Surds3 marks
Expand and simplify (7 + sqrt(3))(7 - sqrt(3)).
- 5Algebraic Fractions3 marks
Write 7/(x + 5) + 3/(x + 2) as a single fraction.
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