exam Maths Puzzle Numerical Ability

Fund the domain of the function:

f(x)=square root of 81-x squared

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exam Other Question

The lenght of a rectangular yard is 25ft more than its width. If the width were doubled, the area of the yard would be 1800ft2. Find the dimensions of the yard. WRITE THE STANDARD EQUATION FOR THE HYPERBOLA WITH FOCI:(7,0) AND (-7,0) AND VERTICES (5,0) AND (-5,0)?