Answer:
B.
4x+9 = 2x-1
Step-by-step explanation:
yes.
this is division. 36 divided by 12 is 3. 63 divided by 21 is 3.
The mid-point for given endpoints is (4,3)
Step-by-step explanation:
a mid-point is the point on a line segment that divides it into two equal portions.
If (x1,y1) and (x2,y2) are the coordinates of vertices of a line segment, then mid-point is given by:

given
(x1,y1) = (9,9)
(x2,y2) = (-1,-3)

The mid-point for given endpoints is (4,3)
Keywords: Coordinate Geometry, Mid-point
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The answer to this question of yours is B
The answer is (5,3) because when a point gets reflected across the x-axis its x coordinate stays the same but its y coordinate switches sign