What would be a reasonable estimate for the value of an in animate divided by six equals 21

Around 120, but 21 times 6 is 126.

Step-by-step explanation:

Since it is known that 20 times 6 is 120, that would be a reasonable estimate because it doesn't account for the ones.

i think the answer is b)

step-by-step explanation:

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.