Final answer:
4305012 written in scientific notation is 4.305012 × 10⁶. Each option presented is a form of scientific notation, not expanded notation, with option (a) being the correct scientific notation for the given number.
Step-by-step explanation:
The question asks for the number 4305012 to be written in expanded notation, which helps express the number in terms of its place value. None of the options given are in correct expanded notation, as they represent the number in a form of scientific notation. However, assuming this is a case of misunderstanding or typo, and we are looking to express 4305012 in scientific notation, we would write it as:
4,305,012 = 4.305012 × 10⁶ = 4.305012 × (1,000,000)
This is because scientific notation involves expressing a number as a product of a number between 1 and 10, and a power of 10. The number 4.305012 is between 1 and 10, and the power of 10 is 6 because we move the decimal point six places to the right to get from 4.305012 to 4305012.