Question

@ranga really need your help atm :)

Answer 1

http://gyazo.com/de1864d350c7d4e57932cb9325dedb33

This is on my test and I literally NEVER learned this, and i'm supposed to finish by 12.

Answer 2

I will be back as soon as I can. In the middle of answering three other people's questions. ....

Answer 3

Okay:) Take your time.

Answer 4

So the deriv is -12/x^5

Answer 5

\[\Large \frac{ \Delta y }{ \Delta x } = \frac{ f(x + \Delta x) - f(x) }{ \Delta x }\]

Answer 6

f(x) = 3x^-4
x = -1, delta_x = 0.1, x + delta_x = -0.9

delta_y = f(-0.9) - f(-1)

Answer 7

So for the top I have -1.5724

Answer 8

delta_y = 3/(-0.9)^4 - 3/(1)^4 = ?

Answer 9

-1.57

Answer 10

That is your delta_y (the answer to the first question. They want the answer rounded to 4 decimal places.
So it should be -1.5725

Answer 11

For the second part, find f'(x) and evaluate it at x = -1
And multiply it by 0.1 (that is, delta_x) and enter the answer to two decimal places.

Answer 12

So -12/-1^5*0.1

Answer 13

yes.

Answer 14

Okay new question! http://gyazo.com/0fb1ef8d2445805b2c8a3e077b98d24b

Answer 15

Wait, for the first part did you get a negative value? It should be positive.

Answer 16

I am getting +1.5725 for the first and 1.2 for the second.

Answer 17

I got 1.5 haha

Answer 18

They want 4 decimal places for the first and two decimal places for the second.

So I would put: 1.5725 for the first and 1.20 for the second.

Answer 19

Okay:)

Answer 20

Yes for the next question 14 is correct for part 1.

For the second part, find the derivative and evaluate it at x = 90.

Answer 21

1260?

Answer 22

R(x) = 14x, so R'(x) = 14.
R'(x) does not depend on x and it is the same 14 at all points of x.
So R'(x) when x = 90 is 14.

Answer 23

The 1260 you got was for R(x) at x = 90. But that is not what they are asking. They want the derivative R'(x) at x = 90.

Answer 24

Can you do me a huge favor and not explain and just answer these next few?

Answer 25

I will do one.

Answer 26

Will you be posting? I have to leave soon.