From the image, the problem asks to order the given scientific notations from smallest to largest. Let's analyze the values:

Given values:

1. $2.5 \cdot 10^{-6}$
2. $1.7 \cdot 10^{-6}$
3. $5.3 \cdot 10^{-5}$
4. $2.5 \cdot 10^{-5}$
5. $5.3 \cdot 10^{-4}$

Step-by-step:

1. Compare the powers of 10. A smaller exponent corresponds to a smaller value (e.g., $10^{-6} < 10^{-5} < 10^{-4}$).
2. Within the same power of 10, compare the coefficients (e.g., for $10^{-6}$, $1.7 < 2.5$).

Ordered values:

• $1.7 \cdot 10^{-6}$ (smallest)
• $2.5 \cdot 10^{-6}$
• $2.5 \cdot 10^{-5}$
• $5.3 \cdot 10^{-5}$
• $5.3 \cdot 10^{-4}$ (largest)

Final answer:

1. $1.7 \cdot 10^{-6}$
2. $2.5 \cdot 10^{-6}$
3. $2.5 \cdot 10^{-5}$
4. $5.3 \cdot 10^{-5}$
5. $5.3 \cdot 10^{-4}$

Would you like further explanation on scientific notation or help with another topic?

Here are some follow-up questions:

1. How is the placement of numbers in scientific notation affected by the exponent?
2. Why does the coefficient matter when the exponent is the same?
3. What is a real-world application of ordering numbers in scientific notation?
4. Can you explain why $10^{-6}$ is smaller than $10^{-5}$?
5. How do you multiply and divide numbers in scientific notation?

Tip: Always start by comparing exponents when ordering numbers in scientific notation.