Write an equivalent expression for 3x + 21

Aof 12 , we to a of 4 to on a .of 4 be ?

Hello, i need compare km^2 and km. what's difference in this?

Amayoral candidate would like to know her residents’ views on a tax on sugar drinks before the mayoral debates. she asks one thousand registered voters from both parties. these voters are an example of a census population convenience sample simple random sample