1/7y+1/4=9/28 Solve Quick Please.

The speed of a falling object increases at a constant rate as time increases since the object was dropped. which graph could represent the relationship betweent time in seconds, and s, speed in meters per second? speed of a falling object object over time

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15