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:

the correct answer is 5 6 and 7

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.