The definition of environmentalism is. A) Company policies aimed at curbing air and water pollution and over-harvesting of forest

B) The study of geology and how climate and to rain affect the evolution of societies

C) A worldwide movement that began in the 1970s and whose purpose is to protect the air, land, and water

D) The study of how children are affected more strongly by their environment than they are by heredity

Atennis club charges a monthly membership fee of $150 and charges it members $10 per hour to use a court. there's also $500 fee to become a member. stella joined the tennis club last spring, and she has been a member for 5 months. she has been playing 10 hours of tennis each month. stella values an hour of her time at $20. during a boring afternoon meeting, stella thinks about reserving a court to work on her serve for an hour tonight. what's stella's opportunity cost of working on her serve for an hour?

In the short-run, marginal costs are equal to the change in variable costs as output changes. ( mc = change in variable cost / change in quantity) assume that capital is fixed in the short-run. (a) start with the equation for marginal cost and derive an equation that relates marginal cost of production to the cost and productivity of labor. (b) draw a standard looking short-run marginal cost curve and use the equation you derived to explain its shape.

Jenna is saving for a sound system. while she is saving for her system, she finds the speakers for her system on sale for a good price and buys them. at the same time, mark is saving up to by a big-screen television. he sees some movies on sale and decides to buy them so that he can watch them on his new television when he buys it. which of the following statements best describes jenna's and mark's actions?