Add or Subtract

question 23

Multiple Choice

Add or subtract. Then simplify. If a denominator has two or more factors (other than monomials) , leave it in factored form. Express the answer using the denominator of the first fraction when applicable.
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Definitions:

Anticoagulant

A substance that prohibits the coagulation of blood.

Antihistamine

A type of medication that blocks histamine, a substance in the body that causes allergy symptoms like itching, swelling, and runny nose.

Duracillin

A brand name for a type of penicillin antibiotic used to treat various bacterial infections.

Coumadin

A medication brand name for warfarin, used to prevent blood clots by thinning the blood.