ECZ 2016 · GCE Paper 2 · Question 10 — Graphs of Functions
y = x2/5 + 2x. Table of values given (x from 0.3 to 6).
(a(i)) Calculate the value of q (y at x = 6), correct to 1 decimal place.[1]
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At x = 6: y = 365+ 26= 7.2 + 0.33 = …(a(ii)) Draw the graph of y = x2/5 + 2x.[3]
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Plot the given (x, y) values on graph paper and join with a smooth curve. The curve falls s…(a(iii)) Use your graph to solve x2/5 + 2x= 3.[2]
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Draw the line y = …(a(iv)(a)) On the same axes, draw the graph of y = x + 72.[1]
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y = x + 72is a straight line. T…(a(iv)(b)) Hence solve x2/5 + 2x= x + 72.[2]
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The solutions are where the line y = x+72crosses the curve y = …(b) K480 invested at 10% per year compound interest. Find the total interest after 3 years.[3]
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Compound interest: A = P(1 + r100)^n = 480(1.1)3The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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