Which best describes the diction in "Ain't I a Woman?" formal and detached formal and scholarly informal and relatable informal and light-hearted

Find an equation (in term of x) of line through the points (-1,3) and (1,4)

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Consider the input and output values for f(x) = 2x - 3 and g(x) = 2x + 7. what is a reasonable explanation for different rules with different input values producing the same sequence?