Higher Plus
12th December 1975
- 13d Pythagoras and Trigonometry3 marks
A cuboid measures 8 cm by 9 cm by 5 cm tall. Work out the angle between its longest internal diagonal and the base, to 1 decimal place.
- 2Conditional Probability3 marks
A bag holds 7 red and 5 blue counters. Two are taken without replacement. Given the first was red, what is the probability the second is blue?
- 3Histograms2 marks
On a histogram, a 10-wide bar and a 20-wide bar have the same frequency density of 1.5. How many more values are in the wider class?
- 4Surds3 marks
Rationalise the denominator of 84/sqrt(7), giving your answer in its simplest form.
- 5Algebraic Fractions3 marks
Simplify (x^2 + 11x + 30)/(x + 6).
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