exam Maths Puzzle Numerical Ability

if sec=5/9, find cos.

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exam Other Question

Please help. -5(1-5x)+5(-8x-2)=-4x-8x Thank you. a playground is situated on a triangular plot of land. two sides of the plot are 175 feet long and they meet at an angle of 70 degrees. for safety reason, a fence is to be placed along the perimeter of the property. How much fencing material is needed?