I think the answer is the second one. A reflection over the x-axis and the a 90° counterclockwise rotation about the origin.
Answer: 
Step-by-step explanation:
If the volume of a sphere is

Where
is the radius
The volume of a hemisphere is half the volume of the total sphere:


Solving this equation:

Finally:

Answer:
y = 1/2x - 7/2
Step-by-step explanation:
y = 1/2x + b
-3 = 1/2(1) + b
-3 = 1/2 + b
-7/2 = b
40 mins left! total time= 60 mins x 3 hours =180 mins. 180 divided by 9 is 20. 20 times 7 is 140. 180-140 equals 40. yay!