Ryan says that $0.6$ is less than $0.60$ because it has fewer digits. Jessie says that $0.6$ is greater than $0.60$. Who is right? Why? Use the area models below to help explain your answer.
$0.6$ _______ $0.60$
Use the symbols <, >, or = to compare.
a. $3.9$ _______ $3.09$
b. $2.4$ _______ 2 ones and 4 hundredths
c. $7.84$ _______ 78 tenths and 4 hundredths