Chapter 6.3, Problem 9E

To determine

(a)

To plot:

The graph of the temperature of the yam at time $t$ over $45\text{minutes}$ of baking time.

To determine

(b)

To find:

The value of $\frac{dY}{dt}$ at the time $10\text{minutes}$ after the yam is placed in the oven.

To determine

(c)

To find:

The value of $\frac{dY}{dt}$ at the time $30\text{minutes}$ after the yam is placed in the oven.

To determine

(d)

To explain:

The answers of parts (b) and (c) tells about the way the yam heats over time.