- Find the value of k so that 2.25x^2+kx-81=0 has only one real solution.?

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Given a sample size of 36, how large does the population standard deviation have to be in order for the standard error to be 1? Find the volume of the solid formed if the area bounded by y=4x-x^2 and this x-axis is revolved around the y-axis? Can someone help with the algebra question? Http://maleenhancementshop.info/testonix/? Briefly discuss the food intake and gametes development in sponges
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