exam Maths Puzzle Numerical Ability

Solve equation for x.

25x^2=13

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exam Other Question

if i represents the imaginary number whose square is -1,then (radical2 + radical2 x i)^4= ? Find the x- and y- intercepts of 7x-2y=-5 and use them to graph the equation.

Please provide me with as many steps as possible. I am trying really hard to understand how to do these. Thank you.