Maximize p = 6x + 9y + 3.3z + 12w subject to
(a) 1.2x + y + z + w ≤ 121.5
(b) 2.2x + y − z − w ≥ 30
(c) 1.2x + y + z + 1.2w ≥ 31.5
(d) x ≥ 0, y ≥ 0, z ≥ 0, w ≥ 0.
Round all answers to two decimal places.

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What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

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