What improvements were made to transportation in georgia after the america

In which research method does a researcher change the value of one variable to determine how the change affects another variable? a. experiment b. observational research c. survey d. case study

This passage would suggest that sudan might have a a) democracy. b) dictatorship. c) command economy. d) communist government.

Energy is the total kinetic energy of particles of matter.(chose wisely & pick one) a. mechanical b.thermal c.electrical d.chemical