Higher Plus
16th June 1978
- 1Direct and Inverse Proportion Depth3 marks
y is directly proportional to sqrt(x). When x = 36, y = 30. Work out y when x = 64.
- 2Finding the Area of Any Triangle3 marks
A triangle has sides of 12 cm and 16 cm and an area of 96.00 cm^2. Work out the acute angle between those two sides, to the nearest degree.
- 3Probability Equation Questions3 marks
A bag holds 8 counters, r of them red. Two are taken without replacement and P(both red) = 3/28. Work out r.
- 4Histograms3 marks
A histogram has four 10-wide classes from 0, with frequency densities 2, 1, 3, 0.5. Which class contains the median?
- 5Surds3 marks
Rationalise the denominator of 18/sqrt(3), giving your answer in its simplest form.
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