Answer:
There will be 35 cannonballs in the stack.
Step-by-step explanation:
Cannonballs are stacked in a pyramid shape with a triangular base of 5 cannonballs on a side.
The top or first layer will have a single cannonball = 1
The second layer down is a triangle that will have [tex]1+2=3[/tex] cannonballs
The third layer will have [tex]1+2+3= 6[/tex] cannonballs
The fourth layer will have [tex]1+2+3+4 =10[/tex] cannonballs
The fifth or bottom layer will have [tex]1+2+3+4+5=15[/tex] cannonball
Adding those all these we get;
[tex]1+3+6+10+15=35[/tex] cannonballs
Hence, there are 35 cannon balls in the stack.
