Daily Practice - Higher Plus
Grades 8-9 - exam-stretch algebra, geometry and reasoning.
5th August 2011
- 13d Pythagoras and Trigonometry3 marks
A cuboid measures 12 cm by 5 cm by 8 cm tall. Work out the angle between its longest internal diagonal and the base, to 1 decimal place.
- 2Conditional Probability3 marks
A bag holds 9 red and 3 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 5-wide bar and a 15-wide bar have the same frequency density of 3. How many more values are in the wider class?
- 4Surds3 marks
Rationalise the denominator of 21/sqrt(3), giving your answer in its simplest form.
- 5Inverse and Composite Functions3 marks
f(x) = 5x - 7 and g(x) = 4x - 7. Work out fg(4).
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