6. (18 points) In this problem you will use logic to find the logical negation of the given sentence. As in the examples, write the sentence as a logic form, negate the form, then use the logical equivalences to manipulate the expression until you get the negation(s) right before variables, like this -A... or like this (A... not like this -(A... a) If a politician seeks the presidency, and she has sufficient financial backing, then she can affoard to appear on nationwide television frequently b) We can halt pollution only if we act now. c) If a worker can share in the company profits, he works harder and he demands fewer fringe benefits