The rule of scientifinc notation is that we can use number between 0 and 10, so here we can use 2.8. Lets do this 280 000 000 = 2.8 100 1 000 000 Now we can just multiply 2.8 by 10 to the power of number of 0 reapeted So \(2.8*10^8\) - its the result