Write your proofs clearly using complete sentences. Try silently reading what you've written and decide if any words are missing. if you introduce new notation or variable names, state explicitly what they represent. Don 't use any symbols such as => or V in your proofs; use words instead. It is allowed and encouraged to work with your classmates on these problems, but your submission must be entirely your own work. Solutions which are copied from a student or another source will receive a score of 0. 6. Write the negations of each of the following statements. Avoid simply adding the word "not" to the statement. a. The temperature in Irvine is always at least 40 degrees. b. We have a 7. c. There are exactly two solutions to the equation f (x) = 0. d. If Carol and Debbie are siblings, then Edward is their dad