Use the mid ordinate rule with 6 strips to find the area bounded by the curve y = x^2 + 1, x = -4, x = 8 and x-axis

Answer 1

Your first step would have been to make a sketch, after that it becomes obvious

From -4 to 8 is 12 units, you want 6 strips, so each strip has a width of 2
the midpoints of these strips (the x's) are at
-3, -1, 1, 3, 5, and 7
the corresponding height, (the y values) are
10, 2, 2, 10, 26, and 50

your estimated area = 2(10+2+2+10+26+50) = .....