Find the midpoint of a segment with the given endpoints. W(12,2), X(7,9) = (
1
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  (9.5, 5.5)

Step-by-step explanation:

The midpoint coordinates are the average of the end point coordinates.

  midpoint = (W+X)/2 = ((12, 2) + (7, 9))/2 = (12+7, 2+9)/2

  midpoint = (9.5, 5.5)

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1