exam Maths Puzzle Numerical Ability

Suppose you travel north for 35 kilometers then travel east 65 kilometers. How far are you from your starting point? North and east can be considered the directions of the y- and x-axis respectively. Round to the tenths place

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An airplane covered 15 mi of its route while decreasing its altitude by 24,000 ft. Find the slope of the line of descent that was followed. (1 mi=5280 ft) Round to the nearest hundredth. he exercise is on the Identities chapter of the book DISCOVERING MATHS 4 (page 65) : ISBN 1-84131-533-8.

13. If x^2+px+q is afactor of x^3+ax^2+b, prove that:
i) b= q(a-p)
ii)