Which equation represents a line which is parallel to x=0x=0?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

In what organelle does photosynthesis take place?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?