The number of spheres in a triangular pyramid with x layers is given by 
a) Find the rate of change of the number of spheres with respect to the number of layers.
b) How many spheres are there in a pyramid 10 layers deep?
c) Find the rate of change when x = 10.
(a) 
(b) 220
(c) 60 1/3 sphere/layer
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A. ln 
+ C
B. ln 
+ C
C. ln 
+ C
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