exam Maths Puzzle Numerical Ability

In a right triangle, the hypotenuse has length 14 cm. and another side has length 12 cm. What is the length of the altitude that is perpendicular to the hypotenuse?

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If the graph of y=2^x is transformed to y=3(2)^(-1/4x-1)+1, what are the coordinates of the new focal point? I think it may be (-4,4) but I am not sure. Can someone please help me?? Homework questions: The area of a circle is found by the equation A=pie*r^2. If the area A of a certain circle is 81pie square centimeters, find its radius r. I need to know how to figure this to be able to get the answer.