Decide Whether or Not the Matrices Are Inverses of Each

question 396

Multiple Choice

Decide whether or not the matrices are inverses of each other.
- $$\left[ \begin{array} { l l } 9 & 4 \\4 & 4\end{array} \right] \text { and } \left[ \begin{array} { r r } - .2 & .2 \\.2 & - .45\end{array} \right]$$

• A) Yes
• B) No

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Definitions:

Breakeven

A financial situation where revenue equals costs, resulting in neither profit nor loss.

Mark-up

The margin calculated by subtracting the cost of a product or service from its sale price, then dividing by the cost, expressed as a percentage.

Retail Price

The price at which goods are sold to the public, typically higher than the wholesale price.

Mark-up

Increment on the buying price of products targeted to offset operational costs and profits.