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Experience:  Over 13,000 accepts & 100% feedback in the old math category
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# MymathLab

### Customer Question

MymathLab
Submitted: 2 years ago.
Category: Calculus and Above
Expert:  Scott replied 2 years ago.

Hi there,

How many questions do you have? What level? Can you post them here?

Thanks,

Scott

Customer: replied 2 years ago.
i'm doing homework on line tangents and i'm stuck on this problem from a book (i have total of 7 questions that i need help with)

The equation for the line tangent to y=5-3x^2 at (-3,-22) is y= ??
Expert:  Scott replied 2 years ago.

Please post all the questions at once, so that I'll be able to tell you if I can help with them all.

-Scott

Customer: replied 2 years ago.
1. The equation for the line tangent to y=5-3x^2 at (-3,-22) is y= ??

2. Using the difination, calculate the derivative of the function. Then find the values of the derivatives as specified. f(x) = 6 - X^2; f '(-7), f '(0), f '(7)
f '(x) = ????

3. Find the average rate of change of the function over the given intervals.
F(x) = 7x^3 +7; A. [3,5] B. [4,-4] <<<< two part question

4. Find the average rate of change of the function over the given intervals.
F(x) = 11x^3 +11; A. [3,5] B. [4,-4] <<<< two part question

5. Find the average rate of change for the function.
f(x) = 1/x-2 BETWEEN x = -7 and x = 0

6. find f(a+h), f(a+h) -f(a) / h, and the instantaneous rate of change of F when a = 3 f(x) =1- 6x^2
f(a+h)=???

7. The revenue (in thousands of dollars) from producing X units of an item is modeled by R(x) = 14x - 0.01x^2. Find the marginal revene at x=400 .
The marginal revenue is ____ dollars per unit
Expert:  Scott replied 2 years ago.

Ok, thanks, XXXXX XXXXX need work shown, or just the answers?

-Scott

Customer: replied 2 years ago.
just the answers...how much is this? and how long will it take?
Expert:  Scott replied 2 years ago.

Ok, that'll save time :)

You offered \$23 for this, but you can always leave a bonus when we finish.

Give me an hour or so.

-Scott

Customer: replied 2 years ago.
ok cool beans
Expert:  Scott replied 2 years ago.

No problem!

-Scott

Expert:  Scott replied 2 years ago.

Here you go!

1. The equation for the line tangent to y=5-3x^2 at (-3,-22) is y= ??
18x + 32

2. Using the difination, calculate the derivative of the function. Then find the values of the derivatives as specified. f(x) = 6 - X^2; f '(-7), f '(0), f '(7)
f '(x) = -2x
f'(-7) = 14
f'(0) = 0
f'(7) = -14

3. Find the average rate of change of the function over the given intervals.
F(x) = 7x^3 +7; A. [3,5]
343

B. [4,-4] <<<< two part question
usually the -4 would be first and the 4 second
112

4. Find the average rate of change of the function over the given intervals.
F(x) = 11x^3 +11; A. [3,5]
539

B. [4,-4] <<<< two part question
usually the -4 would be first and the 4 second
176

5. Find the average rate of change for the function.
f(x) = 1/x-2 BETWEEN x = -7 and x = 0
I'll assume it's 1/(x-2) with the whole x-2 on the bottom.
-1/18

6. find f(a+h), f(a+h) -f(a) / h, and the instantaneous rate of change of F when a = 3
f(x) = 1- 6x^2
f(a+h)= 1 - 6a^2-12ah-6h^2
f(a+h) -f(a) / h = -12a-6h
Then taking the limit as h->0 and plugging in 3
rate when a = 3: -36

7. The revenue (in thousands of dollars) from producing X units of an item is modeled by R(x) = 14x - 0.01x^2. Find the marginal revene at x=400 .
The marginal revenue is 6 dollars per unit

Let me know if you have any questions, and if you're all set, thanks for pressing Accept!
Scott

Satisfied Customers: 17710
Experience: Over 13,000 accepts & 100% feedback in the old math category
Customer: replied 2 years ago.
THANK YOU SOOOOOOOOOOOOOOOOOOOOO MUCH

but i have one more question and it requires me to attach a PIC, because its in graph form, how do i do that??
Expert:  Scott replied 2 years ago.

You can use a free file sharing site like http://www.mediafire.com and then post the sharing link here.

Thanks,

Scott

Customer: replied 2 years ago.
http://www.mediafire.com/i/?1nnwzrgpnehdbfq
Expert:  Scott replied 2 years ago.

Sure:

Use the subscripts for each of the xN's

f(x) is largest at x3
f(x) is smallest at x2
f'(x) is smallest at x5
f'(x) is closest to 0 at x4

Thanks again,

Scott

Customer: replied 2 years ago.
swweeeeeeeeeeeet i will surely come to you next time i neeed help :D
Expert:  Scott replied 2 years ago.

Glad to help, and talk to you soon!

Feel free to leave feedback here: http://www.justanswer.com/feedback/leave-feedback.aspx

-Scott

Customer: replied 2 years ago.
hey scott when are you able to help me out with my cal homework??
Expert:  Scott replied 2 years ago.

Sure, today could work (as long as it's not timed). When you start a new question thread, you can write "For Scott" to get me.

Thanks,

-Scott

Customer: replied 2 years ago.
its atually 2 hour timed but 20 questions...
Expert:  Scott replied 2 years ago.

Oh, if it's timed, please post some sample questions, so I know what type of material, before we start.

-Scott

Customer: replied 2 years ago.
Find the average rate of change of the function over the given intervals.
F(x) = 14x^6 +11; A. [5,6]
Expert:  Scott replied 2 years ago.

Ok, that's fine! Will you need work shown?

I'll be going to dinner shortly, but we can do this later this evening.

-Scott

Customer: replied 2 years ago.
work is really not necessary and i also won't be available until later tonight around 1ish..so sure
Expert:  Scott replied 2 years ago.

Oh, 1am is too late for me, since I'm on the road this week, and won't be up that -- if you need it tonight, you can just post it for any expert. If the deadline isn't tonight, then we can do it another day :)

-Scott

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