Write a Formula for the General Term (The Nth Term)of $r a _ { n }$

question 58

Multiple Choice

Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for $r a _ { n }$ to find $a _ { 20 }$ , the 20th term of the sequence.
- $$\mathrm { a } _ { 1 } = - 9 , \mathrm {~d} = 0.6$$

• A) \(\mathrm { a } _ { \mathrm { n } } = 0.6 \mathrm { n } - 9.6 ; \mathrm { a } _ { 20 } = 2.4\)
• B) \(a _ { n } = 0.6 n - 9 ; a _ { 20 } = 3\)
• C) \(a _ { n } = - 9 n + 9.6 ; a _ { 20 } = - 170.4\)
• D) \(a _ { n } = - 9 n + 0.6 ; a _ { 20 } = - 179.4\)

---

Definitions:

Risk-free Interest Rate

The rate of return on an investment with no risk of financial loss, often associated with government bonds.

Foreign Trade Surplus

A situation where a country's exports exceed its imports over a given period, indicating a positive balance of trade.

Portfolio Riskiness

Refers to the degree of uncertainty or potential financial loss inherent in an investment portfolio.

Beta

A measure of the volatility, or systematic risk, of a security or a portfolio in comparison to the market as a whole. It is used in the capital asset pricing model.