Ineed with geometric sequences!

1,-4,16,-
i need to find the next one someone

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

Rewrite so the subject can be y in the formula d=m-y/y+n