Number of Goldfish Cost
5 $1.50
10 $3.00
15 $4.50
20 $6.00
The cost is a linear function of the number of goldfish. Which statement describes the rate of change of this
function?
A. The cost increases $0.30 each time 1 goldfish is added.
B. The cost increases $1.50 each time 1 goldfish is added.
C. The cost increases $3.00 each time 5 goldfish are added.
D. The cost increases $6.00 each time 5 goldfish