The midpoint M of the line segment AB is (-3,7). If the coordinate of B is (5,-1), what is the coordinate of the point A?

Coordinate of Point A is (-11, 15)

Step-by-step explanation:

M -- (-3, 7)

B -- (5, -1)

Therefore, (5 + x)/2  = -3

x = -11

(-1 + y)/2 = 7

y = 15

Therefore Point A is (-11, 15)

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

i believe the answer is the polygon, heptagon.