fyw2025 fyw2025

22-01-2022
Mathematics

contestada

a boy is building a pyramid out of building blocks. he put 20 blocks in the first row, then he puts 19 blocks in the row above, and so on. find the total number of blocks he needs. find the total number of blocks he need

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sply0992 sply0992

22-01-2022

Answer:

210 blocks

Plz mark me brainliest

Step-by-step explanation:

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sqdancefan sqdancefan

22-01-2022

Answer:

210

Step-by-step explanation:

The formula for the sum of numbers 1 to n is ...

sum = (n/2)(n +1)

The sum of numbers 1 to 20 is ...

sum = (20/2)(20 +1) = 10(21) = 210

The boy will need 210 blocks for his pyramid.

_____

Additional comment

The sequence of totals required for n rows is 1, 3, 6, 10, 15, 21, .... These are called "triangle numbers."

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