tolong dibantu jawab ya....

1. 1^2 + 2^2 + 3^2 + 4^2 = 1 +4 + 9+16 = 30
2. 20
3. 2.1^2 + 2.2^2 + 2.3^2 + 2.4^2 = 4 + 8 + 18 + 32 = 62
4. (3.1^2 + 2.1) + (3.2^2 + 2.2) + (3.3^2 + 2.3) + (3.4^2+2.4) +(3.5^2 + 2.5) = 5 + 16 + 33 + 56 + 85 = 195