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riadik2000 [5.3K]
3 years ago
7

I need some help with this calculus 1 question

Mathematics
1 answer:
Arada [10]3 years ago
4 0

Step-by-step explanation:

f(x) = x \sqrt{9 -  {x}^{2} }  \\  \therefore \: f(x) = \sqrt{9 {x}^{2}  -  {x}^{4} }  \\ \therefore \: f(x) = ({9 {x}^{2}  -  {x}^{4} } )^{ \frac{1}{2} }  \\ differentiating \: both \: sides \: w.r.t. \: x \\  {f}^{'}(x) =  \frac{1}{2}  \times ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} } \\ \hspace{30 pt} \times (9 \times 2x - 4 {x}^{3} ) \\ \therefore \: {f}^{'}(x) =  \frac{1}{2}  \times ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} }  \\\hspace{32 pt}\times (18x - 4 {x}^{3} )  \\ \therefore \: {f}^{'}(x) =  \frac{1}{2}  \times ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} } \\\hspace{32 pt} \times 2(9x - 2 {x}^{3} )  \\  \therefore \: {f}^{'}(x) = ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} }  \times (9x - 2 {x}^{3} )  \\ \therefore \: {f}^{'}(x) =  \frac{1}{x({9 -  {x}^{2} } )^{   \frac{1}{2} } }  \times x(9 - 2 {x}^{2} )  \\  \\   \:  \:  \:  \:  \:  \: \red{ \boxed{ \bold{\therefore \: {f}^{'}(x) =  \frac{(9 - 2 {x}^{2} ) }{ \sqrt{{9 -  {x}^{2} }}}}}}

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Aleah's rectangular garden borders a wall. She buys 80 m of fencing. What are the dimensions of the garden that will maximize it
Arada [10]
Hello!

The dimensions that maximize its area is when the width and the length are the same

The dimensions for the highest area is 40 x 40

The answer is 40 by 40

Hope this helps!
7 0
3 years ago
Describe the relationship between two variables when the correlation coefficient r is one of the following. (a) near –1 strong
zepelin [54]

Answer:

a) strong negative linear correlation.

b) Weak or no linear correlation.

c) strong positive linear correlation.

Step-by-step explanation:

The correlation coefficient r measures the strength and direction (positive or negative) of two variables. The correlation coefficient r is always between -1 and 1. When the coefficient r is negative then the direction of the correlation is downhill (negative) and when it's positive then it's an uphill correlation (positive). Similarly, as the coefficient is closer to -1 or 1 the correlation is stronger, with zero being a non linear relationship.

Now back to the question:

a) Near -1: as we said before, this means an strong negative (-1) linear correlation.

b) Near 0: weak or no linear correlation (we cannot say if its positive or negative because we don't know it it's near zero from the right (positive numbers) or the left (negative numbers)

c) Near 1: strong positive (close to +1) linear correlation

3 0
3 years ago
What is two solutions for x>6
Daniel [21]

7>6

8>6

9>6

etc.

Possible values for x:

x=7

x=8

x=9

etc.

4 0
3 years ago
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Marta_Voda [28]
It is approximately -.4048

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4 0
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Find the radius of the button.<br><br> radius: __ in.
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Answer:

1 3/4 in

Step-by-step explanation:

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