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1. Find the intersections and unions below, and give a proof for each. (a) ∩r∈(0,∞)[−r,r]. (b)...

1. Find the intersections and unions below, and give a proof for each.
(a) ∩r∈(0,∞)[−r,r].
(b) ∩r∈(0,∞)(−r,r).
(c) ∪b∈(0,1][0, b).
(d) ∩a∈(1,2)[a, 2a].
2.Let a be a positive real number. Prove that a+1/a ≥ 2.
# hi can someone help me with this questions please.
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