Question

Did I do this right? The position of an object at time t is given by s(t) = -8 - 9t. Find the instantaneous velocity at t = 1 by finding the derivative.

Answer 1

I got -9

Answer 2

-8 is a constant so it equals 0?

Answer 3

s(t) = -8 - 9t

s ' (t) = -9

s ' (1) = -9

so you are correct

Answer 4

Correct.

Answer 5

yay :) thanks

Answer 6

What about Find the derivative of f(x) = 8/x at x = -1. I get 8, but it tells me it is wrong :/

Answer 7

It is not 8.

Answer 8

Let us look at the derivative of that.