- How do I do this problem 2+3i?

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How to calculate salvage value? Put the following equations into an augmented matrices form:
5x + 8y = 15
2x â€“ 4y = 5? A rotating fan completes 1200 per min. What distance does the point move in one revolution on the tip of a blade, at a radius of 0.15m? What is the current that flows through each of the light bulbs: 40w, 60w, 75w, 100w? Each light is connected to a 120v line? What happens to the mass of copper (ii) when you heat it? Why?