Jumlah \( n \) suku pertama deret aritmetika dinyatakan dengan \( 5 x a d_{n}=n^{2}+5 n \). Suku ke- 20 dari deret aritmetika tersebut adalah

Calculate the gross profit for an item that cost the business \( \$ 12 \) and sold for \( \$ 30 \). Gross Profit \( =\$[?] \)

In an arithmetic sequence where the first term is \( 2 \) and the third term is \( 8 \), what is the common difference?

4. The population of a city is 67,721 and the neighboring city has a population of 52,103 . The difference between two cities is

Find the absolute value of \( 5 \).

\begin{tabular}{l}\( 18 \times 6=6 \times 18 \) \\ \hline Select the correct answer below: \\ \hline Associative \\ \hline Commutative \\ Inverse \\ Identity \\ Distributive \\ \hline\end{tabular}