Higher Plus
17th June 1972
- 1Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^3. When x = 3, y = 54. Work out y when x = 4.
- 2Finding the Area of Any Triangle3 marks
A triangle has sides of 16 cm and 16 cm and an area of 128.00 cm^2. Work out the acute angle between those two sides, to the nearest degree.
- 3Probability Equation Questions3 marks
A bag holds 9 counters, r of them red. Two are taken without replacement and P(both red) = 1/36. Work out r.
- 4Histograms3 marks
On a histogram the bar for 40 < x <= 50 has a frequency density of 1.2. How many values are in that class?
- 5Bounds3 marks
A car covers 260 m (to the nearest 10 m) in 9 s (to the nearest second). Work out the lower bound of its speed, to 2 decimal places.
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