It is not.
400 decimeters = 4,000 cm
4,000 cm = 40 m
Answer:

Step-by-step explanation:
The conjugate of a radical expression is obtained by changing the sign of the middle term.
The conjugate of
is simply 
Therefore, to obtain the conjugate of the given expression we simply shall be changing the negative sign to positive;
The conjugate of
is simply;

Answer:
X=7
Step-by-step explanation:
7*15=105 7-2=5 5*25=125 125+105=230
Answer:
0,-2 and 2,0
Step-by-step explanation: i graphed it on a chart