exam Maths Puzzle Numerical Ability

The directions say "Use product property to simplify the expression".
1.) Radical 240

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exam Other Question

What is the slope and y- intercept

x = -9
cpuld someone check this for me.Thanks in advance for your help.

solve the equation by completing the square

x^2+8x-13=0 i got x=-4+sqrt 29,-4- sqrt 29