An irrational number has an infinite number of decimal places. It never ends.
If the decimal ever ended, then the number would be rational.
Answer:
b A train backed up 7 feet and then moved
forward 7 feet.
Answer:

Step-by-step explanation:
we have : lines 2 x + 4 y = 0 and 2 x + y = 10
Let ,
2 x + 4 y = 0............. (1)
2 x + y = 10...............(2)
solve these equations for x and y
Now subtract (2) from (1) ,we get
3y=-10
⇒y = 
Put the value of y in (1) , we get
2x+4(
) = 0
⇒2x= 
⇒x=
∴ Point of intersection is
.
Hence,the x-coordinate of that point is
.
X=7
3x=11+10
3x=21
The answer is x=7