Answer:
6
∑ n^2
n=1
Step-by-step explanation:
There are 6 terms in the series, so we sum from 1 to 6
The terms are the integers squared
1^1, 2^2, 3^2 4^2, 5^2 6^2 or n^2
6
∑ n^2
n=1
Answer:
Step-by-step explanation:
In similar triangles, the corresponding sides are in same proportion.

Cross multiply,
4x*12 = 15*(3x + 1)
48x = 15*3x + 15*1
48x = 45x + 15
48x -45x = 15
3x = 15
x = 15/3
x = 5
(8/9)^2 is just 8/9 squared, or 8/9 * 8/9. This is 64/81, and cannot be reduced. This is therefore our answer.
Https://www.lcps.org/cms/lib/VA01000195/Centricity/Domain/3686/Unit%208%20Day%201%20extra%20practice%20key%20alg%202%201617.pdf its there