Higher Plus
3rd September 1980
- 1Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^3. When x = 2, y = 32. Work out y when x = 4.
- 2Finding the Area of Any Triangle3 marks
A triangle has sides of 6 cm and 13 cm and an area of 27.58 cm^2. Work out the acute angle between those two sides, to the nearest degree.
- 3Probability 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.
- 4Histograms3 marks
On a histogram the bar for 60 < x <= 65 has a frequency density of 1.5. How many values are in that class?
- 5Bounds3 marks
A rectangle is 8 cm by 4 cm, each correct to the nearest cm. Work out the upper bound of its area.
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