Cos(θ) = -20/√((-20)^2 +(-21)^2)
.. = -20/-√841 . . . . . . . . . . . . . . . . . θ is a 4th-quadrant angle, so cos(θ) > 0
.. = 20/29
The value of the cosine is 20/29.
Answer:

Step-by-step explanation:
we know that

She drove from her house to the airport and back 2 times
so
Multiply the distance from her house to the airport by 4

Answer: 18%
Step-by-step explanation: Add 36 + 14 = 50
Then 36*50/100=18
10/5 = 1/x
cross multiply
10x = 5
x = 5/10
x = 1/2...u need 1/2 gallon per fish