11/2 cups of sugar for every 2/3 cup of flour

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6

I’m still confused on how to work the percentages

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i