Two of them
The phone number of the Portola Valley Library is: 650-851-0560.
The phone number of the Elfreth'S Alley Association is: 215-574-0560.
The phone number of the Blaine County Historical Museum is: 208-720-0560.
There are 4 significant figures in this number.
There are 3 significant figures in this number.
There are 4 significant figures in this number.
There are 2 significant figures in this number.
There are 3 significant figures in this number.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
Three significant figures are in this number.
The number of significant figures is one.
3 significant figures.