Option A: 
Option C: 
Option F: 
Solution:
Given expression is
.
Option A: 



Hence
is equivalent expression of
.
Option B: 



Hence
is not equivalent expression of
.
Option C: 


(proved in option A)
Hence
is equivalent expression of
.
Option D: 


Hence
is not equivalent expression of
.
Option E: 75
75 is a whole number.
Hence 75 is not equivalent expression of
.
Option F: 


(proved in option A)
Hence
is equivalent expression of
.
Therefore,
are all equivalent expressions of
.
Answer:
x=-1,y=0
Step-by-step explanation:
-10y+9x=-9
10y+5x=-5
14x=-14
x=-1
-10y-9=-9
y=0
Answer:
100 miles
Step-by-step explanation:
Relative Speed: 60+40=100 mph
you can think that one train is stationary,another one is 100 mph
so one hour before the train pass each other,the distance is 100 miles
Answer:
42
Step-by-step explanation:
84 divide 2
answer 42
answer =42