Final answer:
The number 76,439.042 is written in word form as 'seventy-six thousand, four hundred thirty-nine and forty-two thousandths.' Scientific notation is used for expressing large or small numbers concisely, such as $7.92 × 10¹° representing $79.2 billion.
Step-by-step explanation:
The number 76,439.042 is written in word form as 'seventy-six thousand, four hundred thirty-nine and forty-two thousandths.'
When working with numbers in mathematics, especially in subjects like algebra or scientific notation, it's important to understand how to express them correctly. For example, scientific notation is a way to write very large or small numbers using powers of ten. The process involves moving the decimal point to create a new number between 1 and 10, followed by multiplying by 10 raised to the appropriate exponent to represent the original number's magnitude. As demonstrated in various examples, large sums of money like $79.2 billion can be concisely written in scientific notation as $7.92 × 10¹°.
It's essential to ensure the correct number of significant figures is maintained during calculations, like when converting 56900 into scientific notation to get 5.69 × 10⁴.