At a school number of boys : number of girls = 11 : 9 there are 124 more boys than girls. work out the total number of students at the school.

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.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225