The Fourth Gate You arrive at the fourth gate, feeling confident in your skills. "It is a good thing I had some practice before landing on this planet", you think. You look carefully at the gate and find the following information, translated by your computer: Each of the limits below represent a piece of the passcode that you must enter to proceed. The parameters a and c represent positive real numbers and should be treated as such in your answer. "Remember," says your computer, "to type "infinity" for oo, "-infinity" for -oo, and "NA" if the limit does not exist." ax 72 lim 13x+37 T 75-37 75 _13x+37 lim ar 2-+00 75-37 ax 75 lim 13x+37 x-700 72- 37