Question

HELP ASAP! question on pic!

Answer 1

HELP! :(

Answer 2

840$

Answer 3

^You're not using matrices.

Answer 4

\[
\begin{bmatrix}
2 & 1 & 3
\end{bmatrix}
\begin{bmatrix}
60 \text{ cents}\\
70 \text{ cents}\\
45 \text{ cents}
\end{bmatrix}
+3
\begin{bmatrix}
2 & 1 & 3
\end{bmatrix}
\begin{bmatrix}
60 \text{ cents}\\
70 \text{ cents}\\
45 \text{ cents}
\end{bmatrix}=\text{ ?}
\]
This is a matrix equation. The first set of matrices represents his first trip to the store. The second set of matrices represents his return back. The \(3\) is there because he buys three times as much as he bought before.

Calculate the first set of matrices and add \(3\) times what you calculated to that. That'll give you the answer.

Answer 5

so is it 13?

Answer 6

*13

Answer 7

Yes. Great job! :)

Answer 8

Thank you so much! :) !!!

Answer 9

You're welcome. :D