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For practicing understanding the implications of lefthand vs. righthand (or lower bound vs. upper bound integrals), it's nice to be able to graph a function with a grid suited to the task. I plotted a portion of using Mathematica.

f[x_] := (x - 2)^2/2;

xMin = 2;

xMax = 6;

xGridStep = 1;

yMin = 0;

yMax = 8;

yGridStep = 1;

xGrid = Range[xMin, xMax, xGridStep];

yGrid = Range[yMin, yMax, yGridStep];

SetOptions[Plot, BaseStyle -> {FontFamily -> "Times", FontSize -> 14}];

Plot[f[x], {x, xMin, xMax}, LabelStyle -> Directive[16],

PlotStyle -> {Black, Thickness[0.005]}, GridLines -> {xGrid, yGrid},

GridLinesStyle -> Directive[Gray], AxesStyle -> Gray]