Over a 20 year period, a certain city recorded a total rainfall of 621 inches. the rainfall during this past year was 28 inches. if the variable "r" stands for the total amount of rain for the other 19 years, which of would be a reasonable value for this variable?

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have