The text extraction from the image was unclear due to quality or other issues. I will manually review and analyze the image to address the questions directly.

Let me solve the questions from the image:

Question 1

Simplify:

$5x - 5 = 5(x - 1)$ The correct simplified form is:
Answer: 5(x - 1)

Question 2

Which of the following is in the simplest form?

Options show fractions like: $\frac{2}{3b}, \frac{3x - 3}{3}, \frac{4x - 8}{2}$ To simplify:
$\frac{3x - 3}{3} = x - 1$
Thus, Answer: $\frac{3x - 3}{3}$.

Question 3

Which of the following is equal to $\frac{2}{3}$?

Among the options, the right one is: $\frac{2x}{3x}$
This simplifies to $\frac{2}{3}$.
Answer: $\frac{2x}{3x}$.

Question 4

Simplify the expression:

$\frac{6x^3}{2x} = 3x^2$
Answer: 3x²

Question 5

What is $\frac{5x}{9} \times \frac{81}{25}$ simplified?

$\frac{5x}{9} \times \frac{81}{25} = \frac{5x \times 81}{9 \times 25} = \frac{405x}{225} = \frac{9x}{5}$
Answer: $\frac{9x}{5}$.

These are some of the answers based on the image. Would you like more detailed solutions or explanations for any specific part of the test?

Here are 5 relative questions for practice:

1. How do you simplify fractions with variables?
2. How do you find common factors in an algebraic expression?
3. What steps do you follow to multiply algebraic fractions?
4. How do you handle common terms in rational expressions?
5. How do you simplify terms that involve powers of a variable?

Tip: When simplifying fractions, always look for the greatest common factor in both the numerator and denominator!