You visit your uncle, a dentist, over winter break. he hands you this x-ray and instructs you to estimate the age of this child, given the eruption time of the permanent molars (6 years old for the first molar, 12 years old for the second, and 18 years old for the third). you reply that the child is in which age range?

The age range of the child is "6 to 12 years".

The first molar has ejected through the jaw bone, yet the second molar is still inside the jaw and its enhancement isn't finished, because it doesn't have roots. That implies the child from which this x-ray came is in the age between 6 and 12 years.

marginal cost is a microeconomic measure that us to evaluate the extent to which the level of production of a good is sustainable in accounting, that is, to how many quantities the company plans to profit from the production of the good.

the concept of marginal cost is simple, it means the cost of producing one more item. for example, in the case of pies, the marginal cost is the cost of producing one more pie than those that have already been produced.

it is important to understand that productive activity influences marginal cost. the marginal cost of some goods can be very high, while others may be insignificant. for example, the marginal cost of producing an extra plane is very high. already the marginal cost of a water company to provide 1l more water is derisory.

in the case of pies, the cost involves the inputs, the labor and the fixed cost, which involves the fixed space of the bakery. the level of production initially has the marginal cost decreasing because there is space and manpower available. however, to produce more you have to hire more workers and buy more inputs. if physical space is limited, workers will conflict with places, inputs and their productivity will decrease, meaning there is an optimum point of production for each level of space and manpower. from this point on, the productivity of the workers will be getting smaller because of lack of space, so that the marginal cost of producing one more pie will be increasing. so, although you have not posted the chart, but if you have the answer, you can see that my explanation goes according to the marginal cost curve that will increase from the 4th pie, answer (c).

c. reserves power to the states and people