$\"\"$

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Consider the amount invested in treasury bills is $\"\"$ and the amount invested in corporate bonds is $\"\"$ .

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(a)

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The total investment cannot exceed $\"\"$ , hence $\"\"$ .

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The amount invested in treasury bills must be at least $\"\"$ , hence $\"\"$ .

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The amount invested in corporate bonds must not exceed $\"\"$ , hence $\"\"$ .

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A non negative amount must be invested , hence $\"\"$ , $\"\"$ .

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Therefore, the system of inequalities are $\"\"$

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$\"\"$

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(b)

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Graph the system and label the corner points.

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Graph :

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Graph the system of equations .

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$\"\"$

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Observe the graph:

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The corner points are $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .

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$\"\"$

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(a) The system of inequalities are $\"\"$

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(b)

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Graph :

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Graph the system of equations .

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$\"\"$

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Observe the graph:

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The corner points are $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .