Evaluate the Sum $$\sum _ { \mathrm { k } = 1 } ^ { 4 } ( - 1 ) ^ { \mathrm { k } } ( \mathrm { k } + 4 )$$

question 57

Multiple Choice

Evaluate the sum. Round to two decimal places, if necessary.
- $$\sum _ { \mathrm { k } = 1 } ^ { 4 } ( - 1 ) ^ { \mathrm { k } } ( \mathrm { k } + 4 )$$

• A) -26
• B) 2
• C) 26
• D) 18

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Definitions:

Striations

Parallel lines or grooves on a surface, often found in muscle fibers and certain crystals.

Myofibril

A long, slender contractile structure within muscle cells, composed of repeating units called sarcomeres, which are responsible for muscle contraction.

Actin

A protein that forms (together with myosin) the contractile filaments of muscle cells and is also involved in motion in other types of cells.