Higher Plus
2nd January 1986
- 1Histograms3 marks
A histogram has two bars: one 20 units wide with frequency density 2.5, one 5 units wide with density 3. How many values in total?
- 2Surds3 marks
Simplify sqrt(20) + sqrt(125), giving your answer in the form a sqrt(b).
- 3Quadratic Simultaneous Equations3 marks
Solve x^2 + y^2 = 169 and y = x + 7 simultaneously.
- 4Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^2. When x = 4, y = 128. Work out the positive value of x when y = 200.
- 53d Pythagoras and Trigonometry3 marks
A cuboid measures 13 cm by 13 cm by 11 cm. Work out the length of the longest diagonal inside it, to 1 decimal place.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of January 1986, including the monthly compilation PDF.