Higher Plus
26th July 1979
- 1Histograms3 marks
A histogram has two bars: one 5 units wide with frequency density 0.4, one 5 units wide with density 3.5. How many values in total?
- 2Surds3 marks
Simplify sqrt(45) + sqrt(5), giving your answer in the form a sqrt(b).
- 3Inverse and Composite Functions3 marks
f(x) = 6x + 1. Work out the inverse function f^-1(x).
- 4Direct and Inverse Proportion Depth3 marks
y is directly proportional to x^2. When x = 3, y = 18. Work out the positive value of x when y = 98.
- 5Proof of the Circle Theorems2 marks
In a circle theorem proof, a step uses the fact that the exterior angle of a cyclic quadrilateral is being found. State the reason being quoted.
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Any date always gives the same five questions, so a sheet can be set again or shared. All of July 1979, including the monthly compilation PDF.