Daily Practice - Higher Plus
Grades 8-9 - exam-stretch algebra, geometry and reasoning.
22nd April 2008
- 13d Pythagoras and Trigonometry3 marks
A cuboid measures 13 cm by 13 cm by 13 cm tall. Work out the angle between its longest internal diagonal and the base, to 1 decimal place.
- 2Conditional Probability3 marks
A bag holds 5 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 4-wide bar and a 8-wide bar have the same frequency density of 2.5. How many more values are in the wider class?
- 4Surds3 marks
Expand and simplify (7 + sqrt(6))(7 - sqrt(6)).
- 5Completing the Square3 marks
Write x^2 + 12x - 1 in the form (x + a)^2 + b.
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