Ireally need on finding the midpoints

First question:

Plot (2,3) and (6,4), and draw a line segment connecting the two points.

The midpoint of this line segment is found as follows:

                           2 + 6
x-component = = 4
                               2
 
                           3+4
y-component = = 7/2 or 3.5
                              2

The midpoint of the line segment is (4, 3.5).

Ignore the - sign for now.   11.3   =   11.3        113
                                                           =
                                                             1             10

Since this is the ratio of two integers, 11.3 is rational.  So is 11.3.

                                                                             83
If you really mean   0.083, this is rational:  it is
                                                                            1000

If y ou meant 0.083333333 ... , that's also rational:  1/12 is equivalent.