What is term for background information

How does langston hughes incorporate meter into his poetry? he envisions a blues singer, singing a raggy tune . he incorporates it to reflect a blues musical timing. he writes jingles for the advertising of depression medication.

Find the center and the radius of the circle with the equation: x^-2x+y^2+4y+1=0

Which sentence would not be appropriate for an essay or formal speech? a) most of the titles of faulkner's novels are references to the bible or to the works of william shakespeare. eliminate b) some critics believe that faulkner's novel the sound and the fury is the best novel of his entire career. c) the novels of william faulkner are way too hard to read, yo, filled with all these frustrating changing narrators! d) william faulkner traveled all the way from his home state of mississippi to sweden in order to make his nobel prize acceptance speech.