exam Maths Puzzle Numerical Ability

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An Airplane covered 15mi of its route while decreasing its altitude by 24,000 ft. Find the slope of the line of descent that was followed. ( 1mi=5280ft) round to

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x + y =-3
2x-y= -3 Cole kicked a football. The equation {{{h=-16t^2+60t}}} describes the height of the ball t seconds after it was kicked. Approximately how many seconds went by before the ball hit