Rachel is a stunt driver, and she's escaping from a building that is about to explode! D represents Rachel's remaining distance (in meters) as a function of time T (in seconds) D=−38t+220 What is Rachel's speed?

Rachel's speed is -38 meters per second.

Step-by-step explanation:

The velocity is the derivative of the position.

In this problem, we have the following position equation:

So

The derivative of the sum is the sum of derivatives.

The derivative of a constant is 0, and of at is a. So

Rachel's speed is -38 meters per second.

Step-by-step explanation:

The speed is the rate of change of the remaining distance in time, which is found by deriving the known formula:

439400

step-by-step explanation:

130^2 = 16900

16900*26 = 439400