PLEASE HELP Problem down below

1 answer:

6 0

Answer:

$50unit^{2}$

Step-by-step explanation:

Δ=

$||\frac{1}{2} \left[\begin{array}{ccc}1&1&1\\7&9&1\\15&3&1\end{array}\right]||= ||-50||=50unit^{2}$

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