book Maths Puzzle Numerical Ability

the equation 1/2x(squared)+4x=0 has two solutions. whats the other?

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The length of a rectangle is 8 inches more than twice its width. If the perimeter of the rectangle is 28 inches, find the width of the rectangle. On a string of pearls, the middle pearl is the largest and most expensive of all. Starting from one end, each pearl is worth $100.00 more that the one before it up until the middle