Question 1174381
Here's how to solve the problems:

**1. Cost Equation**

* Fixed costs: $165
* Variable cost per item: $3
* Cost equation: y = 3x + 165

**2. Revenue Equation**

* Selling price per item: $10
* Revenue equation: y = 10x

**3. Total Costs for 28 Items**

* Total costs = 165 + (3 * 28) = 165 + 84 = $249

**4. Revenue from Selling 28 Items**

* Revenue = 10 * 28 = $280

**5. Profit**

* Profit = Revenue - Total Costs = 280 - 249 = $31

**Answers:**

* Cost equation: 3x + 165
* Revenue equation: 10x
* Cost = $249
* Revenue = $280
* Profit = $31