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- Evaluate the limit. Need help with b. and c. please. For a. I got 0, if you can confirm that. Thank you, will upvoteEvaluate the limits.Show your solutionFind the limit. (If the limit is infinite, enter '∞' or '-∞', as appropriate. If the limit does not otherwise exist, enter DNE.) lim r→∞ r − r3 7 − r2 + 9r3