exam Maths Puzzle Numerical Ability

A parabolic arch has a span of 120 feet and a maximun of 25 feet. choose suitable rectangular coordinate axes and find the equation of the parabola. Then calculate the height of th

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Could use a little help on this one. 4/x+3/4=10/x Find the distance to the nearest hundredth between the points (11,-6) and (-1,-2)
Please explain how this is done, I have several of these on a worksheet and I donot understand them.