Which of the following is not a perfect trinomial hurry

What is the distance between (–2 1/2,-3) and (1, –3)?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.