Necesito ayuda en el libro de santillana matematicas 8 egb alto rendimiento digital pag 151 pls :(

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

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