A and d................................
Answer:
C) 
Step-by-step explanation:
0.51 repeating decimal
x= 0.51515151
multiply by 100 on both sides
100x = 51.515151.........
x= 0.515151...............
--------------------------------------------(subtract)
99x = 51
divide by 99 on both sides

divide both sides by 3

Answer:
a= -3 b=6 c=17 is the correct answer
Step-by-step explanation:
Answer:
x=6,y=0
Step-by-step explanation:
2x+y=12
3x-y=18
5x=30
x=6
6(3)-y=18
18-y=18
y=0