A car manufacturer notices that they can sell 11 cars at £18,200, but in order to sell 12 cars they have to drop the price to £17,400. The marginal cost of producing the 12th car is £9,000. Which of the following statements is correct?.

Explain how you might determine the rate of weathering on a sample rock

In this food web, which group would increase in number if snakes were eliminated? a. producers b. decomposers c. primary consumers d. secondary consumers e. tertiary consumers

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome