Derek wants to plant bushes as a border along a walkway that is 8.5 meters long. He needs to allow 50 centimeters of space for each bush. How many bushes will Derek need to plant to cover the entire length of the walkway?

28. evolution

29. environment, survive, offspring  

explanation:

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;