Answer:
-30
Step-by-step explanation:
I'm assuming the equation is 
. If it is not please tell me.
If we know the values of m and n, we can just substitute inside the expression.
Hope this helped!
Answer:1/2
Step-by-step explanation:
"He starts both trains at the same time. Train A returns to its starting point every 12 seconds and Train B returns to its starting point every 9 seconds". Basically, what you need to do is find the least common multiple. The least common multiple of 12 and 9 is 36, so the least amount of time, in seconds, that both trains will arrive at the starting points at the same time is 36 seconds.
77-27= 50 so when you add both it add up to 77 ,
50 is the answer
