# Practice Problems

## Answers

If , then . When is very small (close to 0, is very close to 6.

If , then When is very small, is very close to 5.

5. All of these answers are approximate. Your answers should be close to these numbers.

(a) average rate of temperature change per hour.

(b) at 10am, temperature was rising about per hour.

at 7pm, temperature was rising about per hour (falling about per hour).

7. All of these answers are approximate. Your answers should be close to these numbers.

(a) average velocity feet per second.

(b) average velocity feet per second.

(c) at seconds, velocity feet per second (between 20 and .

at seconds, velocity feet per second.

at seconds, velocity feet per second.

(b) the area of the rectangle bounded below by the -axis, above by the line , on the left by the vertical line , and on the right by the vertical line .