public static double findAreaUnderCurve(double from, double to, int rectangles, Function function) {
        double area = 0.0; // Current Area
        double length = (to - from) / rectangles; // Length of each rectangle

        // HIGHER
        // r is the beginning + length, and while it is less than the end (to), continue to preform the equation and add
        // the length every time it loops.
        for (double r = from + length; r < to; r += length) {
            area += length * function.calculate(r);
            // function.calculate(r) means it uses the respective equation in https://pastebin.com/kpGC5mCN
        }

        // LOWER
        // r is the beginning + length, and while it is less than the end (to), continue to preform the equation and add
        // the length every time it loops.
        for (double r = from; r <= to; r += length) {
            area += length * function.calculate(r);
            // function.calculate(r) means it uses the respective equation in https://pastebin.com/kpGC5mCN
        }

        return area / 2; // Divide by 2 for average
    }