For \(n\) items, \(f(n)~=~8n~\text{dollars}\) and \(g(n)~=~12n~+~20~\text{dollars}\) are two charges on the same order. Add the functions to write \((f~+~g)(n)\), then interpret its output.

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(f - g)(n) = -4n - 20. It adds the charges to give total order cost in dollars.

(f + g)(n) = 20n + 20. It gives the total number of items.

(f + g)(n) = 20n + 20. It adds the two order charges to give total order cost for n items, in dollars.

(f + g)(n) = 20n. It adds the charges to give total order cost in dollars.

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Curriculum context

Course: Math I
Standard: F-BF.1.b
Category: Functions
Domain: Building Functions
Objective: Combine standard functions using arithmetic operations to build models.
Problem type: Add two functions and interpret the combined output