The nth pyramidal number tells how many balls there are in a pyramidal stack that is n layers tall. What kind of pyramid is the stack?
A. A three-sided pyramid
B. A golden pyramid
C. A five-sided pyramid
D. A Fibonacci pyramid
E. A four-sided pyramid

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Ответ:

kidre9663

08.09.2021

Mathematics

We can do anything to an equation as long as we do it to both sides
remember the associative property of addition

a+(b+c)=(a+b)+c
so
12+(7+m)=(12+7)+m=19+m

19+m=30
minus 19 both sides
19-19+m=30-19
0+m=11
m=11

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The nth pyramidal number tells how many balls there are in a pyramidal stack that is n layers tall. What kind of pyramid is the stack? A. A three-sided pyramid B. A golden pyramid C. A five-sided pyramid D. A Fibonacci pyramid E. A four-sided pyramid