Answer:
355 is the constant of proportionality
Step-by-step explanation:
The direct proportional relationship says that:

then, the equation is of the form is given by:
where k is the constant of proportionality.
As per the statement:
Tammy rents an apartment close to her school campus. The amount that she spends on rent is given by the equation :
r = 355 m
where,
r is the amount spent on rent and
m is the number of months she stays in the apartment.
By definition of proportional relationship:

⇒ k = 355 m
Therefore, the constant of proportionality (r to m) for this proportional relationship is, 355