exam Maths Puzzle Numerical Ability

Find one set of polar coordinates for the point given in rectangular coordinates. The equation is {{{(2,-3)}}}.

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exam Other Question

Tell wheather the given value of the varible is a solution of the equation.
-9x+7=25+2(5-x);x=-4.

Thank u for all the help! Using the digits 1-9 in order, insert operation signs and grouping symbols to get the value of 100. you can only use a number once.Help Me. Please...