I honestly don't know because i'm only in sixth grade but I think that it might be 30*.
Apologies for the bad handwriting.
Yes it is true! it is true because two different numbers go to the same number, if it was false it would have to be the one number to two different numbers.
Hope that made sense!
The train will have been traveling for 4 hours
train A=45,90,135, 180
train B=0,60,120,180
Answer:
a 3,5,5,11
b 3,3,37,3
- 2,269
d 113, as it is a prime factor
