Final answer:
The correct equation that represents Kacey's total earnings with a fixed salary and a commission on sales is: Earnings = $400 + 0.35(Sales).
Step-by-step explanation:
The question requires writing an equation to represent Kacey's total earnings based on her salary and commission. Since Kacey earns a fixed salary plus a percentage of her sales, the correct equation to represent the situation where Kacey earns $400 each week as salary and a 35% commission on her total sales is:
Earnings = $400 + 0.35(Sales)
This equation includes a constant term for the fixed salary and a variable term that accounts for the commission she earns from sales.