exam Maths Puzzle Numerical Ability

Biologists want to set up a station to test alligators in the lake for West Nile Virus. Suppose that the cost for such a station are $2,500 for set up costs and $3.00 to administer

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Solve for x and y

[ 4 1 3] * [9 -2]= [ y 5]
-2 x 1 2 1 -13 11
-1 4 The crowd that heard the President speak was estimated to be 10,000 people. The actual crowd could be 750 people more or less than this. What are the possible values for the actual crowd size?