6. El número de habitantes por km cuadrado o la densidad de población de una isla es 250. El numero de árboles por persona es 6. Si la superficie total mide 140 km cuadrados, ¿Cuántos arboles hay en la isla?

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)