Higher Plus
25th March 1990
- 1Bounds3 marks
x = 141 and y = 47, each correct to the nearest whole number. Work out the upper bound of x - y.
- 2Inverse and Composite Functions3 marks
f(x) = 2x - 8 and g(x) = 5x + 8. Work out fg(4).
- 3Direct and Inverse Proportion Depth3 marks
y is inversely proportional to x^2. When x = 4, y = 36. Work out y when x = 6.
- 4Finding the Area of Any Triangle3 marks
A triangle has sides of 16 cm and 10 cm and an area of 69.28 cm^2. Work out the acute angle between those two sides, to the nearest degree.
- 5Probability Equation Questions3 marks
A bag holds 10 counters, r of them red. Two are taken without replacement and P(both red) = 1/15. Work out r.
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