The answer choice which is true about the sum of the two polynomials as described in the task content is Choice B; The sum is a binomial with a degree of 3.
It follows from the task content that the polynomials in discuss whose sum is to be determined are; 6s²t - 2st² and 4s²t - 3st².
On this note, it follows upon addition by means of collecting like terms that;
6s²t + 4s²t - 2st² -3st²
= 10s²t - 5st².
It therefore follows from the resulting polynomial that; it is a binomial as it has 2 terms with a degree of 3.
Remarks:
a.) The sum is a binomial with a degree of 2.
b.) The sum is a binomial with a degree of 3.
c.) The sum is a trinomial with a degree of 2.
d.) The sum is a trinomial with a degree of 3.
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