Question

mrs. levin told students how many rounds to expect in the spelling bee based on previous years.
rounds in the spelling bee
according to the table, when was the rate of decrease greater?
between 2016 and 2017
between 2015 and 2018

Explanation:

Step1: Calculate the rate of decrease between 2016 and 2017

The formula for the rate of decrease is \( \text{Rate of Decrease}=\frac{\text{Initial Value}-\text{Final Value}}{\text{Initial Value}} \).
For 2016 - 2017: Initial value \(= 15\), Final value \(= 13\).
\( \text{Rate of Decrease}=\frac{15 - 13}{15}=\frac{2}{15}\approx0.133\)

Step2: Calculate the rate of decrease between 2015 and 2018

For 2015 - 2018: Initial value \(= 18\), Final value \(= 15\).
\( \text{Rate of Decrease}=\frac{18- 15}{18}=\frac{3}{18}=\frac{1}{6}\approx0.167\)

Answer:

Between 2015 and 2018