Write a System of Equations to Describe the Problem Situation $x - y = 30,0.10 x + 0.25 y = 3.50$

question 12

Multiple Choice

Write a system of equations to describe the problem situation. It is not necessary to solve the problem. Nancy has $3.50. She has only dimes (x) and quarters (y) . She has 30 coins altogether.

• A) x = 30 - y, 0.10x + 0.25y = 3.50
• B) \(x - y = 30,0.10 x + 0.25 y = 3.50\)
• C) y - x = 30, 0.10x + 0.25y = 3.50
• D) x + y = 30, 0.05x + 0.25y = 3.50
• E) \(x + y = 30,0.05 y + 0.25 x = 3.50\)

---

Definitions:

Volley Principle

Principle addressing limitations of the frequency theory of hearing, stating that a cluster of nerve cells can fire neural impulses in rapid succession, producing a volley of impulses.

Perceptual Set

A predisposition or readiness to perceive something in a particular way.

Selective Attention

The process by which a person focuses on one stimulus or task while ignoring other stimuli, highlighting the capacity to prioritize cognitive processing.

Absolute Threshold

The minimum amount of stimulus energy that a person can detect.