exam Maths Puzzle Numerical Ability

Thank you in advance for help with this equation. x^4-8x^2+11=0

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exam Other Question

The bottom of a 13-foot long ladder is placed 5 feet away from a wall so that the ladder rests against the top. Assuming the wall is perpendicular to the ground, what is the height of the wall? can someone please explain this problem to me

Write an equation in slope-intercept form that satisfies each condition.

passes trough (4.) and is parallel to x+2y=4

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