By direct use of the definition of derivative,find 
(f(x))if f(x)= 3 
+ 5x - 4.
Definitions:
Cost-Plus Pricing
A pricing approach that involves adding a consistent percentage or fixed sum to the production cost of a product or service to set its sale price.
Absorption Cost
A costing method that includes all manufacturing costs - direct materials, direct labor, and both variable and fixed manufacturing overhead - in the cost of a product.
Return On Investment
A performance measure used to evaluate the efficiency or profitability of an investment, calculated by dividing the profit from an investment by the cost of the investment.
Price Per Unit
Price per unit describes the cost of a single unit of product or service, providing a basis for evaluating and comparing the value of similar items.
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