Use the Given Information to Write an Equation

question 41

Multiple Choice

Use the given information to write an equation. Let x represent the number described in the exercise. Then solve the
equation and find the number.
-A number subtracted from eighteen is four.

• A) 18 - x = 4; 14
• B) 18 + x = 4; -14
• C) x - 18 = 4; 22
• D) 18 - 4 = x; 14

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Definitions:

Dextro-

Prefix indicating the right-handed (clockwise) configuration of a chiral molecule, often used in stereochemistry.

Levorotatory

Relating to a substance that rotates the plane of polarized light to the left.

Optical Activity

The ability of a molecule to rotate plane-polarized light, a property used to distinguish between enantiomers in stereochemistry.

Enantiomers

Molecules that are mirror images of each other but cannot be superimposed upon one another, similar to left and right hands.