The altitude of an airplane is decreasing at a rate of 45 feet per second. What is the change in altitude of the airplane over a period of 25 seconds?

Question

A.
70 feet
B.
1,125 feet
C.
-1,125 feet
D.
-70 feet

Answer 1

To calculate the change in altitude of the airplane over a period of 25 seconds, you can use the formula:

\[ \text{Change in altitude} = \text{rate of change} \times \text{time} \]

In this case, the rate of change is -45 feet per second (since the altitude is decreasing), and the time is 25 seconds.

Now, calculate the change in altitude:

\[ \text{Change in altitude} = -45 , \text{feet/second} \times 25 , \text{seconds} = -1125 , \text{feet} \]

So, the correct answer is:

C. -1,125 feet