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3 years ago

HELP ASAP I DONT HAVE TIME IT ALSO DETECTS IF ITS RIGHT OR WRONG

Mathematics

1 answer:

storchak [24]3 years ago

5 0

Answer:

9/2*1/6=0.75

Step-by-step explanation:

hope this helped!!!!

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Suppose Riley is interested in the cost of a gallon of gas in her state. She finds the cost of a gallon of regular gas at 61 ran

hichkok12 [17]

Answer:

The standard deviation of the sample is 0.0064.

Step-by-step explanation:

The standard deviation of a sample of length n of a population with standard deviation $\sigma$ is given by the following formula:

$s = \frac{\sigma}{\sqrt{n}}$

In this problem, we have that:

61 randomly selected gas stations. This means that $n = 61$

The standard error of the mean is $0.05. This means that $\sigma = 0.05$ .

What is the standard deviation of the sample?

$s = \frac{\sigma}{\sqrt{n}} = \frac{0.05}{\sqrt{61}} = 0.0064$

The standard deviation of the sample is 0.0064.

5 0

3 years ago

4<br> Subtract. Write the expression below in simplest form.<br> (-x + 3) - (4x-10)

ycow [4]

Answer:

Step-by-step explanation:

(-x + 3) - (4x - 10)

= - x + 3 - 4x + 10 (because when you see the minus sign you have to change all the sign inside the bracket)

= -5x + 13 (this step is just subtract -x and -4x and 10 + 3)

5 0

3 years ago

Consider f and c below. f(x, y, z) = yzexzi + exzj + xyexzk,

Jet001 [13]

Answer:

$f(x,y,z)=ye^{xz}+C$

Step-by-step explanation:

We can write the given expression as :

$\vec f(x,y,z)=yze^{xz}\,\vec\imath+e^{xz}\,\vec\jmath+xye^{xz}\,\vec k$

As given, f = ∇f.

∇f = $\dfrac{\partial f}{\partial x}i$ + $\dfrac{\partial f}{\partial y}j$ + $\dfrac{\partial f}{\partial z}k$

We can write the partial derivative with respect to x, y and z.

$\dfrac{\partial f}{\partial x}=yze^{xz}$ ___(Equation 1)

$\dfrac{\partial f}{\partial y}=e^{xz}$ ______(Equation 2)

$\dfrac{\partial f}{\partial z}=xye^{xz}$ ______(Equation 3)

Take equation 2 and integrate with respect to y,

$\dfrac{\partial f}{\partial y}=e^{xz}$

$f(x,y,z)=ye^{xz}+a(x,z)$ ----------Equation 4

Derivate both sides w.r.t x , we get :

$\frac{d}{dx}(yze^{xz})=yze^{xz}+\dfrac{\partial a}{\partial x}$

$\dfrac{\partial a}{\partial x}=0$

integrate

a(x,z)=b(z)

put in equation 4 ,

we get :

$f(x,y,z)=ye^{xz}+b(z)$

take derivative wrt z

$\frac{d}{dz} (ye^{xz}+b(z))\impliesxye^{xz}=xye^{xz}+\frac{db}{dz}$

we can take here:

$\frac{db}{dz} = 0$

integrate:

$\int\ {\frac{db}{dz} } \, =\int0$

b(z) = C

The function can be written as :

from equation 4 :

$f(x,y,z)=ye^{xz}+C$

Where C is a constant.

4 0

3 years ago

Of the 125 students. Three fifths have a mobile phone.How many students don't have a mobile phone?

vovangra [49]

Answer:

$\frac25\cdot125=\boxed{50}$

Step-by-step explanation:

3/5 students have a mobile phone, so 2/5 don't have it

4 0

3 years ago

Need this answered. <br><br> Please Show work, Thanks! :)

guapka [62]

Answer:

Answer: A, (3x+5)(x+7)

Step-by-step explanation:

3x*x = 3x^2

3x*7=21x

5*x= 5x

5*7=35

Then, Combine like terms.

21x+5x= 26x

3x^2+26x+35

And that's it, pretty simple.

8 0

3 years ago