I know that b and d are correct because c is just silly and a is just incorrect :)
Answer:
20 tea bags
Step-by-step explanation:
if 5 is 1 gallon then you do 5x4=20
Answer:

Step-by-step explanation:
Since angle RTS is a right angle, we have three similar triangles.
Thus, 
Cross Products, 
Take the square root: 
Answer:
1. I have simplified the first question:

2. I have found the parabola properties:

Answer:
(-4, 3] U (3, 8]
Step-by-step explanation:
The first lines range is (-4,3]
(the round bracket is because the -4 not included ( clear circle) and the square on because the 3 is included in the range ( the filled circle))
second line - range is (3, 8]
So its (-4, 3] U (3, 8]