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damaskus [11]
3 years ago
9

Help. I'lll try to give brainliest if two people answer

Mathematics
1 answer:
sleet_krkn [62]3 years ago
3 0

Answer:

x = 21

Step-by-step explanation:

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Find y' by implicit differentiation √x +√y =1
AleksandrR [38]
Differentiate both sides with respect to x

\frac{d}{dx}(x^{\frac{1}{2}} + y^{\frac{1}{2}}) = \frac{d}{dx}(1)\\\\ \frac{1}{2x^{\frac{1}{2}}} + \frac{1}{2y^{\frac{1}{2}}}\frac{dy}{dx} = 0\\\\\frac{1}{2y^{\frac{1}{2}}}\frac{dy}{dx} = -\frac{1}{2x^{\frac{1}{2}}}\\\\\frac{1}{2\sqrt{y}}\frac{dy}{dx} = -\frac{1}{2\sqrt{x}} \\\\\frac{dy}{dx} = -\frac{1}{2\sqrt{x}} \times 2\sqrt{y}\\\\\frac{dy}{dx} = -\frac{\sqrt{y}}{\sqrt{x}} \\\\\boxed{\bf{y'= -\frac{\sqrt{y}}{\sqrt{x}}}}
5 0
3 years ago
2. Following are the marks obtained by a batch of 10 students in a
timurjin [86]

Answer:

Students level of knowledge is higher in accountancy  (Y) compared to statistics (X).

Step-by-step explanation:

The level of knowledge of the students in each subject can be known by comparing the mean score of the subjects.

Marks of the students in statistics (X) are: 63 64 62 32 30 60 47 46 35 28

mean = \frac{63 +64+62+32+30+60+47+46+35+28}{10}

          = \frac{467}{10}

          = 46.7

The mean mark of students in statistics (X) is 46.7.

Marks of students in accountancy (Y) are: 68 66 35 42 26 85 44 80 33 72

mean = \frac{68+66+35+42+26+85+44+80+33+72}{10}

         = \frac{551}{10}

         = 55.1

The mean mark of students in accountancy (Y) is 55.1.

It can be inferred that students level of knowledge is higher in accountancy  (Y) compared to statistics (X).

8 0
3 years ago
What is the vertex of the graph of this equation y= -4x^2-16x-12
Lisa [10]
One way to locate the vertex is to obtain the coefficients a, b and c from the quadratic and then calculate  
                                      -(-16)
x = -b / (2a).  Here, x = ---------- = -2
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Next, evaluate y at x = -2:  y = -4(-2)^2 - 16(-2) - 12 = -16 + 32  - 12
                                           y = 4

the vertex is at (-2,4).
4 0
3 years ago
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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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