Atrain travels 63 kilometers in 2 hours, and then 72 kilometers in 4 hours. what is its average speed?

Which one of the following research methods can show cause and effect

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Select all that applywhat are some basic resources a family is expected to provide for children? educationclothesspending