Iknow this is not for but this is something to have fun with. (brainteaser) there are two brothers. one of them you can see the other one you can't, one of them you can hear the other on you can't. what are they?

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?