Higher Plus
10th August 1979
- 1Direct and Inverse Proportion Depth3 marks
y is inversely proportional to x^2. When x = 4, y = 36. Work out y when x = 6.
- 2Finding the Area of Any Triangle3 marks
A triangle has sides of 13 cm and 15 cm and an area of 84.44 cm^2. Work out the acute angle between those two sides, to the nearest degree.
- 3Probability Equation Questions3 marks
A bag holds 11 counters, r of them red. Two are taken without replacement and P(both red) = 1/55. Work out r.
- 4Histograms3 marks
A histogram has four 10-wide classes from 0, with frequency densities 1, 3, 0.5, 2. Which class contains the median?
- 5Surds3 marks
Rationalise the denominator of 99/sqrt(11), giving your answer in its simplest form.
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