Well first you have to add common like terms in this case 2r and -6r to get -4r now your equation is -4r+8=40, now subtract 8 from both sides to leave r by itself and get -4r=32, now divide both sides by -4 to get r=-8
Hope this helps
Answer:
9: not congruent AB=-8 and CD=10
10: not congruent AC=-3 and BD=5
11: congruent BC=1 and AD=1
Answer:
47
Step-by-step explanation:
a line adds up to 180 so 180-133=47
Answer:
The slope is 1/3
Step-by-step explanation:
8 – 5 = 3
_____________
7 – -2 = 9
3/9=1/3
Answer:
159cm
Step-by-step explanation:
Sum of all sides of triangles is 180
so, 15+6=21
then 180-21=159
