Describe how the relationship between sickle cell disease and malaria is an example of natural selection in humans.

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

How can you find the mean absolute deviation (mad) for this set of data?

In the diagram, a building cast a 35-ft shadow and a flagpole casts an 8-ft shadow. if the the flagpole is 18 ft tall, how tall is the building? round the the nearest tenth.