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Question: logic sets theorys proofs class can you help me understand...

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Logic Sets, Theory’s, Proofs Class (Can you help me understand #1 problem)?
1. Let/ = [0,00). For r E l define Br = {(x,y) E Rx R : x2 + y2 r2} C, {(x,y) E Rx R : x2 + y2 > r a) Determine JA,and A b) Determine UB, and B, c) Determine JC, and C, rEl rEl rEI rEl rEl 2. Prove that if a is any odd integer and b is any even integer, then 2a +3b is even. 3. Prove that for all a,b.c,d e Z,tal b and e Id, then aclbd 4. Suppose x,y Z. Ifx and y are odd, then ry is odd. 5. Suppose a is an integer. t 5|2a, then 5 | a.
Must be submitted in a one pa Let I = [0,00). For r E 1 define Ar = {(x, y) R × R : x2 + y2 = r2} a) Determine JA, and A, b)j Determine JB, andB, ) Determine UC, and nc, reI rEI rEI rEl rEI rEl 2. Prove that if a is any odd integer and b is any 3. Prove that for all a, b,c, d E Z,falb and cl
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