Answer
a)87 inches
b)87 inches
Work Step by Step
a. left-endpoint values.
D $\approx$(0)(1) (12)(1) (22)(1) (10)(1) (5)(1) (13)(1) (11)(1) (6)(1) (2)(1) (6)(1) 87 inches
.
b. right-endpoint values
D $\approx$(12)(1) (22)(1) (10)(1) (5)(1) (13)(1) (11)(1) (6)(1) (2)(1) (6)(1) (0)(1) 87 inches