I think the parent function is
y=x
Answer:

Step-by-step explanation:
Given:
Radius of spherical tank, 
Volume of a quarter of a sphere is given as:

Plug in 70 ft for
,
for
and solve for the volume,
. This gives,

Therefore, the volume of the quarter sphere shaped tank is 
The first and the third one because they equal each other
2x+2=2(x+1) and 3(x-1)=3x-3
Answer:

Step-by-step explanation:
I am assuming that the functions are:

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Hope this helps you!
Answer:
21
Step-by-step explanation:
21-12=9