Let's analyze each statement regarding the polynomials:
1. **5x²y − 6xy³z + 3x⁵ is a fifth-degree polynomial**:
The degree of a polynomial is determined by the term with the highest total exponent. Here, the term 3x⁵ has the highest degree (5).
**This statement is true.**
2. **5x²y − 6xy³z + 3x⁵ contains four terms**:
This polynomial has three distinct terms: 5x²y, -6xy³z, and 3x⁵.
**This statement is false.**
3. **5x²y − 6xy³ + 3x⁵ has a leading coefficient of 3**:
Among the terms, 3x⁵ is the term with the highest degree (5), and its leading coefficient is 3.
**This statement is true.**
4. **12a⁵ − 7 + 3a⁷ + 11^a is equivalent to 3a⁷ + 12a⁵ + 11^a − 7**:
The expression is equivalent because addition is commutative, so the order does not affect the sum.
**This statement is true.**
5. **12a⁵ − 7 + 3a⁷ + 11^a has a leading term of 12a⁵**:
The term with the highest degree in this polynomial is 3a⁷ (degree 7), not 12a⁵ (degree 5).
**This statement is false.**
6. **12a⁵ − 7 + 3a⁷ + 11^a has a constant of 7**:
The constant term is -7, since it is the term without a variable.
**This statement is false.**
**Summary of True Statements:**
- 1 and 3, and 4 are true statements.