So we want to know the value of 5.7x10^8. First we need to see what does 10^8 is equal to: 10^8=10*10*10*10*10*10*10*10 Or in other words it is equal to multiplying number 10 eight times by itself. So: 5.7*10^8=5.7*1 000 000 00= 570 000 000 so the correct answer is b.
