Which of the following is the estimated sum of fifty-five, sixty, and sixty-five using compatible numbers?
a. 170
b. 180
c. 190
d. 200

C. 190

Round each number

55→60.

60→60

65→70

Then add all of your rounded numbers.

60+60+70=190

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

what statement? is there an image?