Answer: a.1.55x 109
Explanation:
In the study of Physics and Mathematics, sometimes we see very large or very small numbers. In both cases, the number of digits to write is very large. There is a simple and practical way of writing such numbers without having to write many zeros, this method is known as scientific notation. In the case we use a power of 10:
1,550,000,000 = 1.55x109
