Two continental tectonic plates move apart at about 3 cm/year. How wide will the gap between those continents be in 15 years?

45 cm in 15 years

here you go.

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.