Which algebraic expression is a trinomial?

Will mark brainliest if you answer ! the taco shop sold 198 lunches friday. this number is 3 more than 3 times the number they sold monday. let n represent the number of lunches sold monday. which equation shows an equality between two different ways of expressing the number of lunches sold on friday? a. n – 3 = 198 b. 3n – 3 = 198 c. 3n + 3 = 198 d. n + 3 = 198

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Ineed to know the answer to this algebra question.