for each item below, calculate the interval Sinf less equal to A less than equal Ssup, for the area a under the curve of the function F(x) given in the respective interval of interest ( a ,b ), subdividing the interval into three equal parts.

\fb) f (x) = -4x2 + x +5; [-1,0] 4+ 4 -- 3- 3 -- 1 - 1 - 1 - - -1c) f(x) = -=+7;[-6,0] aly 5. 13. 2 2 - 1 -1 -5 -3 -2 -1 -5