Which shows the expression below in simplified form? (2.2 × 1012) + (1.7 × 109)

1) First, work out the brackets. (2.2 x 1012)= 2226.4
                                                  (1.7 x 109)=185.3

2) Next, because there is a plus sign between the brackets, you need to add up both the answers. 
                              2226.4 + 185.3= 2411.7 ← and that is your answer!