Answer:
17:27
Step-by-step explanation:
You would start with 34:54
this reduces to 17:27
If m=4 and n=4 then m=n
4=4
1=1
Answer: 7.2
Step-by-step explanation:

If x = 3 and y =2 then 8x+7y= 38
and 2y = 4x is correct
hope it helps :)
edit i was incorrect about second answer it would be
2y =4x-4