Answer:
Step-by-step explanation:
The second one I believe.
Answer:
The answer is: If I do not listen to this song, then it will not get stuck in my head.
By definitions of the (co)tangent and cosecant function,

Turn everything into fractions with common denominators:

Recall that
, so we can simplify both sides a bit.
On the left:

On the right:

(as long as
, which happens in the interval
when
or
)
So we have





Answer:
(6r+7)+(13+7r)=13r+20
(13-1/2r)-(1-r)=12-1/2r
(-8-r)+(2r-4)=-12+r
Last one is r-13/6
Step-by-step explanation:
11 pound patties
Make it an improper fraction and divide it by 1/4