Simple Interest Problem

Suppose 30=a×60.
What is 30/a

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In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn.if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?