Please help with a) b) e) j) of this question. Thank you.

3.7.21. Write the negation of the following statements without using the negation symbol -. Also, for each statement, decide whether it is true or false. Explain your answer briefly. (a) (Vr ER)( y ER)(x2 > y2) (b) (3r E Z) [(x2 = (x + 1)2) = (23 Ez)] @2017 Shay Fuchs. All rights reserved. 79 3.7. EXERCISES FOR CHAPTER 3 CHAPTER 3. INFORMAL LOGIC (c) (Vn E N)[(n - 1)3 +n3 # (n+ 1) 3] (d) [(Vr E R)(x > 0)] = [(Vr ER)(x= r+1)] (e) (Vr E R)[(x2 5 -1) = [(2+1)2 =x2+1]] (f) (Vr E R) [(x > 0) = (3n EN)(n.x> 1)] (g) (Vr ER) ( 3y ER)[(x + y)2 = =2+ y?] (h) (]y ER) (Vr ER)(|x + yl = (x| + lyl) (i) (VI E Q) (7n EN) (n . TEZ) (j) (Vr ER) (Vy ER) [((x + y