Higher Plus
28th April 1989
- 1Histograms3 marks
A histogram has two bars: one 20 units wide with frequency density 1.2, one 5 units wide with density 3.5. How many values in total?
- 2Surds3 marks
Rationalise the denominator of 77/sqrt(7), giving your answer in its simplest form.
- 3Factorising Harder Quadratics3 marks
Solve 4x^2 + 8x + 3 = 0.
- 4Velocity Time Graphs2 marks
On a velocity-time graph a car speeds up in a straight line from 8 m/s to 13 m/s over 10 seconds. Work out the acceleration.
- 5Perpendicular Lines and the equation of a tangent3 marks
The point (20, 21) lies on the circle x^2 + y^2 = 841. Work out the gradient of the tangent to the circle at that point.
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