Write a Formula for the General Term (The Nth Term) $$a _ { 1 } = - 7 , d = 0.5$$

question 100

Multiple Choice

Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for an to find a20,
the 20th term of the sequence.
- $$a _ { 1 } = - 7 , d = 0.5$$

• A) \(a _ { n } = - 7 n + 7.5 ; a _ { 20 } = - 132.5\)
• B) \(a _ { n } = - 7 n + 0.5 ; a _ { 20 } = - 139.5\)
• C) \(a _ { n } = 0.5 n - 7 ; a _ { 20 } = 3\)
• D) \(a _ { n } = 0.5 n - 7.5 ; a _ { 20 } = 2.5\)

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Definitions:

Radius

The radius is one of the two large bones of the forearm, located on the thumb side when the palm is facing up.

Ulna

The longer of the two bones in the forearm, running parallel to the radius and forming the elbow joint at its larger end.

Coronoid Process

A protruding structure on the upper jaw bone or on the ulna at the elbow, serving as an attachment point for muscles.

Intertubercular Sulcus

A groove on the humerus bone that houses the tendon of the biceps brachii muscle.