Higher Plus
25th November 1982
- 1Histograms2 marks
On a histogram, a 4-wide bar and a 8-wide bar have the same frequency density of 2. How many more values are in the wider class?
- 2Surds3 marks
Simplify sqrt(50) + sqrt(18), giving your answer in the form a sqrt(b).
- 3Factorising Harder Quadratics3 marks
Solve 9x^2 + 9x - 10 = 0.
- 4Velocity Time Graphs3 marks
A tram runs at 20 m/s for 20 s, then slows steadily to rest over 4 s. Work out its average speed for the whole journey, to 2 decimal places.
- 53d Pythagoras and Trigonometry3 marks
A cuboid measures 13 cm by 9 cm by 14 cm tall. Work out the angle between its longest internal diagonal and the base, to 1 decimal place.
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