calculus

1. (9)

Consider the function shown in the following image:

Evaluate .

Multiple choices

A. -1

B. 0

C. 1

D. Does not exist

2.

A research lab grows a type of bacterium in culture in a circular region. The radius of the circle, measured in centimeters, is given by , where  is time measured in hours passed since a circle of a 1cm radius of the bacterium was put into the culture. Express the area, , of the bacteria as a function of time, and find the approximate area of the bacterial culture in 4 hours.

A(t) = ?