Complete the following calculations:

A. 9.41 X 10^-34 + 7.7 X 10^-35 + ?

B. 8.150 X 10¹³ - 9 X 10¹⁴ = ?

Extra Practice:

A. 17 X 10^-8 - 17 X 10^-9 = ?

B. 0.921 X 10⁸ + 4 X 10⁷ = ?

C. 3.3X 10¹² + 4.11 X 10¹⁴ = ?