Question

part 2 of 2
three friends are buying seashells at the gift shop on the beach. melanie buys 2 seashells for $0.80. rosi buys 5 seashells for $2.00. carlos buys 4 seashells for $1.60. use a graph to determine whether the number of seashells and the cost have a proportional relationship. if so, what is the constant of proportionality and what does it mean?
click the icon to view the blank graph
determine whether the number of seashells and the cost have a proportional relationship. if so, what is the constant of proportionality and what does it mean? select the correct choice below and,
if necessary, fill in the answer boxes to complete your choice.
a. the number of seashells and the cost have a proportional relationship. the constant of proportionality is which means the cost is $ per shell.
(type integers or decimals)

Explanation:

Step1: Calculate unit price for each person

For Melanie: $\frac{0.80}{2}=0.40$
For Rosi: $\frac{2.00}{5}=0.40$
For Carlos: $\frac{1.60}{4}=0.40$

Answer:

A. The number of seashells and the cost have a proportional relationship. The constant of proportionality is $0.40$, which means the cost is $\$0.40$ per shell.