The midpoint of AB is M (5,5). If the coordinates of A are (7,8), what are the
coordinates of B?

(9, 11)

Step-by-step explanation:

To find the coordinate B use the midpoint formula

Now plug in x1 = 5 and y1 = 5

Now it should look like this

 AND  

Now solve

For the first one multiply each side by 2

5 + x2 = 14

Next subtract each side by 5 making x2 = 9

Now for y2 do the same thing

5 + y2 = 16

y2 = 11

for the points

step-by-step explanation:

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.