Explanation: In the solution, we have a 10^-19. This means that we will need to take a 10^-19 as a common factor from all terms. For the first term: 3.4 * 10^-20 = 0.34 * 10^-19 For the second term: 5.4 * 10^-19 already has a 10^-19 in it For the third term: 9 * 10^-20 = 0.9 * 10^-19
Therefore, the given expression: (3.4*10^-20) + (5.4*10^-19) + (9*10^-20) can be rewritten as: (0.34 * 10^-19) + (5.4 * 10^-19) + (0.9 * 10^-19) Take 10^-19 as a common factor and compute the sum as follows: (0.34 * 10^-19) + (5.4 * 10^-19) + (0.9 * 10^-19) = 10^-19 (0.34+5.4+0.9) = 6.64 * 10^-19
