Kenneth S. answered • 04/14/16

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What is confusing is that you appear to believe that you'll get a numerical answer for D but you have only supplied numerical values of u, t and k, omitting a value for r.

On the other hand, if the question were phrased "solve for r in terms of the other variables and their values" that could be done. YOU MUST LEARN THIS TYPE OF SKILL. Do not accept your present shortcoming because it will be a severe obstacle!

Rachel S.

^{2 }was a 'r' or a 't' due to how it looks on my paper, I think when I worked out I presumed it was a t so i used substitution and got my answer, does this make sense?04/14/16