Exercise 7.1 Part 1 A. Determine if each statement is a proposition. 1. Every triangle is a polygon. 2. All right angles are congruent. 3. x is greater than or equal to -2. 4. If x + 2 = 4, is x = 27 5. The sum of the interior angles in a triangle 6. Some rectangles are not parallelograms. 7. Each equilateral triangle is an isosceles triangle. 8. For all values of a and b, (a + b)(a - b) = a2 - b2. 9. If a is a real number, a? > 0. 10. Bisect an angle.B. Determine whether each statement is A, E. I, or O proposition 11. Every problem has a solution. 12. All heroes are not immortals. 13. No man is an island. 14. Excellence is not always rewarded. 15. Not every shiny object is gold. 16. Some typhoons are nor Pacific Ocean-origin. 17. Alibis are never accepted. 18. No non-reader will be left behind. 19. Not every non-taxpayer are not paying. 20. Not every uninformed citizen are ignorant