1. If A-1 = ·(63) 4 and B-1 = (132) find (AB)-1, (AT)-1 and (2A)-1 -2 0 2. A wildlife management team studied the reproduction rates of deer in three tracts of a wildlife preserve. The team recorded the number of females( x) in each tract and the percent of females (y) in each tract that had offspring the following year. The table shows the results. Number (x) 75 900 120 Percent (y) 25 43 51 Find the least squares regression line for the data. 3. An industrial system with three industries has the input-output matrix D and external demand matrix E below. 0.2 0.3 0.1 1000 D = 0.2 0.4 0.3 E = 2000 0.0 0.1 0.0 3000 Find the output X for this industrial system? Note: Feel free to use calculator.

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