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I see you've uploaded an image containing a few mathematical problems. Let's go through them one by one:

### Problem 13:
**Question**: The area of a square-shaped handkerchief is \( 1.875 \, \text{cm}^2 \). What is the length of the side of the handkerchief?

We know that the area of a square is given by:
\[
A = s^2
\]
Where \( A \) is the area and \( s \) is the side length. To find \( s \), we take the square root of the area:
\[
s = \sqrt{1.875 \, \text{cm}^2}
\]

I'll calculate that for you.

### Problem 14:
**Question**: A rectangle has a length of \( 5 \frac{1}{3} \, \text{cm} \) and a width of \( 3 \frac{5}{8} \, \text{cm} \). What is the area of the rectangle?

The area of a rectangle is given by:
\[
A = \text{length} \times \text{width}
\]

I'll convert the mixed fractions into improper fractions and then calculate the area.

### Problem 15:
**Question**: The scientific notation for \( 123,000,000 \) is?

We need to express \( 123,000,000 \) in the form of \( a \times 10^n \).

Let me calculate the answers for these questions!Here are the answers to the questions in the image:

### Problem 13:
The side length of the handkerchief is approximately \( 1.37 \, \text{cm} \).

### Problem 14:
The area of the rectangle is approximately \( 19.33 \, \text{cm}^2 \).

### Problem 15:
The scientific notation of \( 123,000,000 \) is \( 12.3 \times 10^7 \).

If you have any more questions or need further details, feel free to ask!

Here are 5 related questions for further practice:
1. What is the area of a square with a side length of 5 cm?
2. Convert \( 4 \frac{1}{2} \) into an improper fraction.
3. How do you find the perimeter of a rectangle?
4. What is the scientific notation of \( 456,000,000 \)?
5. If the area of a square is \( 9 \, \text{cm}^2 \), what is the length of one side?

**Tip**: When converting mixed fractions to improper fractions, multiply the whole number by the denominator and then add the numerator.

The image contains three math problems involving the area of a square, the area of a rectangle, and scientific notation. The user seeks help in solving them.

Learn how to solve problems involving the area of a square (A = s^2), the area of a rectangle (A = length × width), and expressing numbers in scientific notation (a × 10^n). These problems are suitable for students in Grades 5-7.

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