Find the Nth Term and the Indicated Term of the Arithmetic

question 210

Multiple Choice

Find the nth term and the indicated term of the arithmetic sequence whose initial term, a, and common difference, d, are
given.
- $$\begin{array} { l } \mathrm { a } = 9 ; \mathrm { d } = - 9 \\\mathrm { a } _ { \mathrm { n } } = ? ; \mathrm { a } _ { 13 } = ?\end{array}$$

• A) \(a _ { n } = 18 - 9 n ; a _ { 13 } = - 99\)
• B) \(a _ { n } = 18 - 9 n ; a _ { 13 } = - 54\)
• C) \(a _ { n } = 9 - 9 n ; a _ { 13 } = - 99\)
• D) \(a _ { n } = 18 + 9 n ; a _ { 13 } = - 99\)

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Definitions:

Polymorphism

A programming concept allowing objects of different classes to be treated as objects of a common superclass, enabling multiple forms of behavior.

Upcasting

The casting of a derived class object to a base class object, which typically does not require an explicit type casting.

Derived Class

In object-oriented programming, a class that extends functionality from another class, acquiring its attributes and methods with the possibility of introducing new features and overwriting existing ones.

Base Class

The class from which other classes inherit properties and methods, often referred to as the superclass.