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A teacher offers ten possible assignments for extra credit in a course but requires students to choose them, without looking, from a hat. Six assignments involve library research and four are computer programming exercises. Suppose that a student chooses two assignments, one after the other, at random without replacement. What is the probability that at least one of the assignments is a computer programming exercise?

The Hadley cells in the Southern Hemisphere produce ____ along the surface as air moves toward the equator. 

Air that has grown cold over the poles begins blowing toward the equator at the surface, turning to the west as it does so. Between 50° and 60° latitude, the air turns poleward completing a circuit called _____. 

Let X= {a, b, c} and Y= {u, v}. Which of the following arrow diagrams define functions from X to Y ?

Heat capacity is a measure of the heat required to _____. 

What is the tendency of a substance to resist change in temperature with the gain or loss of heat called? 

The two atmospheric circulation cells that converge at the equatorial low creating the doldrums are known as _____. 

What cycle refers to the constant motion of water as it circulates between the oceans, the atmosphere, and the land? 

The flow of surface water in the ocean around the periphery of an ocean basin is called a _____. 

The temperature and water content of air greatly influence its _____.