If the graphs of linear equations in a system are concurrent, having the same slope and the same y-intercept, what does that mean about the possible solution(s) of the system?

The graph below shows the height of a projectile t seconds after it is launched. if acceleration due to gravity is -16 ft/s2, which equation models the height of the projectile correctly?

Akitchen is 12 ft. by 14 ft. with 10 ft. high walls. how much would it cost to put vinyl flooring in this room? $8.80 per ft

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?