Register
The first square number is 1, and the sum of the first 20 square numbers is 2870. Work out the sum of the first 21 square numbers
196k views
5 votes
The first square number is 1, and the sum of the first 20 square numbers is 2870.

Work out the sum of the first 21 square numbers

User JKLIR
by
7.5k points

1 Answer

6 votes
21²=21×21
21×21=441

2,870+441=3,221
User Samra
by
8.0k points
← Prev Question Next Question →

Related questions

Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers

Other Questions

What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
A dealer sells a certain type of chair and a table for $40. He also sells the same sort of table and a desk for $83 or a chair and a desk for $77. Find the price of a chair, table, and of a desk.
Link Copied!