Higher Plus
16th March 1967
- 1Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^3. When x = 4, y = 128. Work out y when x = 3.
- 2Finding the Area of Any Triangle3 marks
A triangle has sides of 9 cm and 9 cm and an area of 28.64 cm^2. Work out the acute angle between those two sides, to the nearest degree.
- 3Probability Equation Questions3 marks
A bag holds 6 counters, r of them red. Two are taken without replacement and P(both red) = 1/15. Work out r.
- 4Histograms3 marks
On a histogram the bar for 0 < x <= 5 has a frequency density of 2.4. How many values are in that class?
- 5Surds3 marks
Simplify sqrt(72) + sqrt(98), giving your answer in the form a sqrt(b).
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