Higher Plus
1st September 1977
- 1Direct and Inverse Proportion Depth3 marks
y is directly proportional to sqrt(x). When x = 16, y = 12. Work out y when x = 36.
- 2The Cosine Rule3 marks
A triangle has sides 18 cm, 6 cm and 16 cm. Work out the angle opposite the 18 cm side, to 1 decimal place.
- 3Probability Equation Questions3 marks
A bag holds 4 red and n blue counters. The probability of taking a red is 1/2. Work out n.
- 4Histograms3 marks
A histogram has four 20-wide classes from 0, with frequency densities 0.5, 3, 1, 2. Which class contains the median?
- 5Surds3 marks
Simplify sqrt(50) + sqrt(32), giving your answer in the form a sqrt(b).
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