Daily Practice - Higher Plus
Grades 8-9 - exam-stretch algebra, geometry and reasoning.
12th March 2009
- 13d Pythagoras and Trigonometry3 marks
A cuboid measures 10 cm by 14 cm by 6 cm. Work out the length of the longest diagonal inside it, to 1 decimal place.
- 2Probability Equation Questions3 marks
A bag holds 8 red and n blue counters. The probability of taking a red is 8/15. Work out n.
- 3Histograms2 marks
On a histogram, a 5-wide bar and a 10-wide bar have the same frequency density of 2.5. How many more values are in the wider class?
- 4Surds3 marks
Simplify sqrt(8) + sqrt(50), giving your answer in the form a sqrt(b).
- 5Proof2 marks
In an algebraic proof, how would you write the square of an odd number in terms of an integer n?
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