Final answer:
To determine which polynomials are in standard form, we need to arrange the terms in descending order of powers of the variable, with no missing powers. Therefore, the correct answers are B
Step-by-step explanation:
In standard form, a polynomial is written in descending order of powers of the variable, with no missing powers. So, out of the given options:
A. 4 - 1 is not in standard form because the terms are not in descending order. It should be written as -1 + 4.
B. -2t² + 3t + 4 is in standard form because the terms are in descending order: -2t² + 3t + 4.
C. 4 - 7 is not in standard form because the terms are not in descending order. It should be written as -7 + 4.
Therefore, the correct answers are B. -2t² + 3t + 4. None of the other options are in standard form.