Calc 1 Question please help

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1.) Use l'Hopital's Rule (if possible) to determine the limits below, if one does not exist state why a. ) lim x-e -* * - 25 b.) lim = 1+5x-3x - 10 4x C.) lim - sin Bx 7.) Wilbur is out camping with his friends and accidently starts a fire. The fire is growing in a circular pattern with the radius changing at a rate of 4 meters per minute. What is the rate of change of the burning area when the radius is 100 meters