The Sum of 8 and Twice a Number Is Equal

question 281

Multiple Choice

The sum of 8 and twice a number is equal to three times the number. What is the number?

• A) -8
• B) 8
• C) -9
• D) -7
• E) 7

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Definitions:

ADP

Adenosine Diphosphate, a molecule involved in the energy transfer within cells and plays a role in the conversion to ATP.

Phospholipids

A class of lipids that form the primary structural component of cellular membranes, characterized by a hydrophobic tail and hydrophilic head.

Hydrophilic Region

A part of a molecule that has affinity for water and can form hydrogen bonds with water molecules.

Hydrophobic Region

A part of a molecule that is repelled by water and typically soluble in nonpolar solvents.