Answer:
-90 , 30
Step-by-step explanation:
sina = cos(2a)
= 1 - 2(sina)^2
2(sina)^2 + sina -- 1 = 0
( sina + 1 )( 2sina - 1 ) = 0
sina = -1 or sina = 1/2
=> a = -90 degrees or => a = 30 degrees
4n - 8 = n + 13
4n - n = 13 + 8
3n = 21
n = 21/3
n = 7....the number(n) = 7
Answer:
<h2>Let's call
the number of dollars Paul owers.</h2>
Notice that the word "minus" refers to a difference.
So, basically, we just need to subtract 18 from the variable as follows
Therefore, the expression which represents the number of dollars Paul owes minus 18 is
This is very easy to solve once you understanding writing equations. In this case, we could do n+6=100 because we know that the number of songs he has now (n) plus 6 will equal 100. Below is a solution for this equation.
n+6=100
-6 -6
n=94
After solving our equation, we know that Kirk has 94 songs.
