Daily Practice

Higher Plus

21st May 1981

5 questions · 14 marks · Grades 8-9 · 51 question types in this band

1
Probability Equation Questions3 marks
A bag holds 9 counters, r of them red. Two are taken without replacement and P(both red) = 1/6. Work out r.
2
Histograms3 marks
On a histogram the bar for 60 < x <= 80 has a frequency density of 3.5. How many values are in that class?
3
Surds3 marks
Simplify sqrt(80) + sqrt(80), giving your answer in the form a sqrt(b).
4
Inverse and Composite Functions3 marks
f(x) = 6x + 2 and g(x) = 2x + 3. Work out fg(2).
5
Velocity Time Graphs2 marks
A train slows steadily from 40 m/s to rest in 4 seconds. Work out its deceleration.

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