book Maths Puzzle Numerical Ability

The diagonal of a square television screen measures 18 inches. What is the length of the sides?

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How would I figure out what the coordinates of the vertex is for y = x^2 - 4x + 5. I came up with the answer of (2,1). If this is correct thank you but if not please break it down Kim bought a total of $2.65 worth of postage stamps in four denominations. If she bought an equal number of 5-cent and 25-cent stamps and twice as many 10-cent stamps as 5-cent sta