Find All Replacements (Less Than the Modulus) for the Question

question 77

Multiple Choice

Find all replacements (less than the modulus) for the question mark that make the statement true.
-9 ∙ 4 ≡ ? (mod 7)

• A) 4
• B) 6
• C) 2
• D) 1

---

Definitions:

Cardiac Output

The volume of blood pumped by the heart per minute, a critical measure of heart function and efficiency.

Peripheral Tissue Perfusion

The process of delivering blood to the outer surfaces of the body, vital for delivering oxygen and nutrients to various tissues.

Cardiac Contractility

The ability of heart muscle cells to contract, determining the force with which the heart pumps blood throughout the body.

Angiotensin-Converting Enzyme

A key enzyme in the renin-angiotensin system, involved in regulating blood pressure by converting angiotensin I to the potent vasoconstrictor angiotensin II.