Decide Whether the Matrices Are Inverses of Each Other $\left[\begin{array}{ll}-5 & 1 \\ -7 & 1\end{array}\right]$

question 75

True/False

Decide whether the matrices are inverses of each other. (Check to see if their product is the identity matrix I.)
- $\left[\begin{array}{ll}-5 & 1 \\ -7 & 1\end{array}\right]$ and $\left[\begin{array}{cc}\frac{1}{2} & -\frac{1}{2} \\ \frac{7}{2} & -\frac{5}{2}\end{array}\right]$

---

Definitions:

Electronic Funds Transfer

The electronic transfer of money from one bank account to another, either within the same financial institution or across different institutions.

Net Sales

The sum of sales income left over after subtracting returns, compensations for damaged or missing items, and price reductions.

Accounts Receivable

Money owed to a business by its customers for goods or services delivered but not yet paid for, often considered as an asset on the balance sheet.

Days' Sales Uncollected

A financial metric that measures the average number of days it takes for a company to collect payments from its credit sales.