15+(10-x)=15 would be your equation if that is what you are looking for.
C
Step-by-step explanation:
This has a U like shape so it a parabola.
Parabola correlate with quadratic functions

Since it Going down, the answer is C -x^2.
410.3ft^3. is correct
volume of the sphere with 3ft radius :

volume of the sphere with 5ft radius:

difference

good luck
Answer:
Y=-2/3x+6
Step-by-step explanation:
Y=-2/3x+b
2=-2/3•6+b
2=-4+b
6=b