Ineed with 7,8,9,10,12, and 13 pls!

Step-by-step explanation:

7) R(3 , -9)  ;  S ( -4,5) ,T (-8,13)

RS = √(x₂ - x₁)² + (y₂ - y₁)²

= √(-4 -3)² + ( 5 - [-9] )² = √(-4 -3)² + ( 5 + 9 )²

= √(-7)² + ( 14)²   =√ 49 + 196= √ 245

ST = √( -8 - [-4] )²+ (13 - 5)² +  = √(-8 + 4)² + ( 13 - 5 )²

= √(-4)² + ( 8)²   =√ 16 + 64= √ 80

RS ≠ ST

8) S is not the midpoint of RT.

9) AB = 14

AB + BC = AC

14 + 3X - 4 = 4X + 4

4X - 3X = 14 - 4 - 4

X = 6

AC = 4x + 4 = 4*6 + 4 = 24 + 4 = 28

BC = 3x - 4 = 3*6 - 4 = 18 -4 = 14

10)AB  = BC .So B is  the midpoint of AC

150

step-by-step explanation:

(sorry i'm not typing it again just read the other two explanation sections i just typed it'll be the same.)