Question

A restaurant sells tea for $1.50 plus $0.50 per refill. The restaurant brews enough tea for 4 refills per customer. The linear function that represents the total cost of r tea refills is C(r)=0.5r+1.5. Describe an appropriate domain of this function. Make sure to identify the set of numbers appropriate to the domain.

Answer 1

Answer: The domain, r is equivalent to W = {0, 1, 2, 3,...}

Explanation:

Answer 2

The correct option is;

The domain, r is equivalent to W = {0, 1, 2, 3,...}

Explanation:

The cost for each cup of tea sold by the restaurant = $1.50

The cost per tea refill = $0.50

The amount of tea the restaurant brews = 4 refills per customer

The cost of r tea refills C(r) is given as follows;

C(r) = 0.5·r + 1.5

The domain is the set of all whole, W, numbers or the set of all natural numbers including 0

r = W = {0, 1, 2, 3,...}.