exam Maths Puzzle Numerical Ability

Could use a little help on this one. 4/x+3/4=10/x

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How do you find the Base of a Triangular Pyramid with a side length 3square root of 3 and with the apothem length of 3? i really need to know this answer with an explanation becau 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