Answer:
- 2
Step-by-step explanation:

5x+12z Because you take, 3z+9z and that is equivalent to 12z. and then you put the 5x back into the equation so it is 5x+12z
The intersection of two planes is always a line
Answer:
13.31 minutes
Step-by-step explanation:
800 in 30min
400 in 15 min
26 passengers in an min
346/26
13.31 minutes