Daily Practice - Higher Plus
Grades 8-9 - exam-stretch algebra, geometry and reasoning.
11th July 2017
- 1Probability Equation Questions3 marks
A bag holds 10 counters, r of them red. Two are taken without replacement and P(both red) = 2/15. Work out r.
- 2Histograms3 marks
On a histogram the bar for 20 < x <= 30 has a frequency density of 3.5. How many values are in that class?
- 3Surds3 marks
Expand and simplify (6 + sqrt(10))(6 - sqrt(10)).
- 4Proof2 marks
In an algebraic proof, how would you write a multiple of 9 in terms of an integer n?
- 5Velocity Time Graphs2 marks
A train slows steadily from 15 m/s to rest in 8 seconds. Work out its deceleration.
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