Answer:
Sin 90 = 1/1 = 1
Use trigonometry formula and a triangle with lengths of 1
You need to use pemdas i will give i the answer in a minute
Answer:
If you beg for help like that you won't get any.
Step-by-step explanation:
Let "x" represent the age of Brian.
Andrew is elder than Brian by 2 years, we can symbolize his age as "x+2"
Frank is twice as old as Andrew, we can symbolize his age as "2(x+2)"
Sarah has half the age of Brian's, we can symbolize her age as "x/2"
Frank ans Sarah's ages differ by 40 years, we can symbolize this as:

Solve the term is parenthesis

x=24 years
Andrew's age is

Andrew is 26 years old