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# MymathLab Answers Needed

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I need help with MymathLab answers.

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)
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

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

-Scott

Customer: replied 5 years ago.
just the answers...how much is this? and how long will it take?

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 5 years ago.
ok cool beans

No problem!

-Scott

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

Scott and other Calculus and Above Specialists are ready to help you
Customer: replied 5 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??

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

Thanks,

Scott

Customer: replied 5 years ago.
http://www.mediafire.com/i/?1nnwzrgpnehdbfq

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 5 years ago.
swweeeeeeeeeeeet i will surely come to you next time i neeed help :D