1. Is there a real number whose square is 1 ? a. Is there a real number x such that ? b. Does there exist such that x2=1? 4. Given any real number, there is a real number that is greater. a. Given any real number r, there is s such that s is b. For any such that s>r. 7. Rewrite the following statements less formally, without using variables. Determine, as best as you can, whether the statements are true or false. a. There are real numbers u and v with the property that u+v