Command economies produce goods that a. consumers demand b. the government thinks are best c. were produced in the past d. producers believe are necessary

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before

In the late 1990s, brazil’s poor people protested about crowded cities land distribution mining permits industrial pollution

An enormous wave generated by an earthquake beneath the seafloor is known as a