Question

Pb and Sn are extracted from their chief ore by
(a) carbon reduction and self reduction.
(b) self reduction and carbon reduction.
(c) electrolysis and self reduction.
(d) self reduction and electrolysis.

Answer 1

Your answer is

B) self reduction and carbon reduction

Answer 2

Answer:

If is continuous function, and is a closed and bounded interval, then contains both an absolute maximum and an absolute minimum on . Proof: Let be a closed and bounded interval and be a continuous function. Then by the Boundedness Theorem, is bounded on .

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