A jeweler orders necklaces from a website that offers $6 shipping for any-size order. Each necklace costs $7. The jeweler wants to know the total cost of ordering n necklaces. What is the independent (input) variable?

c = $7n + $6

Step-by-step explanation:

$6 shipping for any size

$7 per necklace

let n equal the quantity of necklaces and c equal the total cost.

you buy n amount of necklaces and add the shipping cost to find your cost.

What is the independent (input) variable?

n, the number of necklaces

What is the dependent (output) variable?

c, the total cost in dollars

What is the domain?

n = 0, 1, 2, 3 ...

Which equation expresses the order's total cost, c, as a function of the number of necklaces, n?

c (n) = 7n + 6

Which expression means "the total cost, including shipping, of 5 necklaces"?

c (5)