exam Maths Puzzle Numerical Ability

What is the reciprocal of 3x over 7?

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exam Other Question

topic: 30-60-90 triangle in geometry

a triangle with sides 12 and 15 intercepts an angle of 60 degrees. Find the third side.

NOTE: Letters to represent sides dont mater in this problem
f of(x)=x(to the third)-5x(squared)-25x+125, find the zeros. For each zero you find, state whether the graph of f(s)crosses or only touches the x-axis.