Help plz I don't understand

Mathematics

1 answer:

ollegr [7]3 years ago

8 0

Answer:

AB ≈ 9.11

Step-by-step explanation:

Using the tangent ratio in the right triangle

tan44° = $\frac{opposite}{adjacent}$ = $\frac{AC}{AB}$ = $\frac{8.8}{AB}$ ( multiply both sides by AB )

AB × tan44° = 8.8 ( divide both sides by tan44° )

AB = $\frac{8.8}{tan44}$ ≈ 9.11 ( to 3 sf )

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Given the system of equations:

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$\left[\begin{array}{ccc}1&1&2\\2&4&-3\\3&6&-5\end{array}\right] \left[\begin{array}{c}x\\y\\z\end{array}\right] = \left[\begin{array}{c}9\\1\\0\end{array}\right] \\\\\\ \left[\begin{array}{c}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc}1&1&2\\2&4&-3\\3&6&-5\end{array}\right] ^{-1} \left[\begin{array}{c}9\\1\\0\end{array}\right] \\\\\\$

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