4. Write 365 billion in scientific notation. 5. Write 45 millionth in scientific notation.

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**4. Expressing 365 billion in scientific notation:**

365 billion can be written as  
$$
365\,000\,000\,000
$$

To write this in scientific notation, we place the decimal point after the first non-zero digit:

$$
365\,000\,000\,000 = 3.65 \times 10^{11}
$$

---

**5. Expressing 45 millionth in scientific notation:**

"45 millionth" means 45 divided by 1,000,000, i.e.,

$$
\frac{45}{1\,000\,000} = 0.000045
$$

To convert this into scientific notation, we write it as:

$$
0.000045 = 4.5 \times 10^{-5}
$$
365 billion in scientific notation is $$3.65 \times 10^{11}$$. 45 millionth in scientific notation is $$4.5 \times 10^{-5}$$.

4. Write 365 billion in scientific notation. 5. Write 45 millionth in scientific notation.

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