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4 years ago

15

WILL MARK BRAINLIEST !!!!!!!!PLEASE HELP!!!

1 answer:

bezimeni [28]4 years ago

3 0

Answer:

314 mi^2 (3 s.f.)

Step-by-step explanation:

$surface \: area \: of \: sphere = 4\pi {r}^{2}$

diameter of sphere= 10mi

radius of sphere= 10÷2= 5mi

Surface area of sphere= 4(pi)(5^2)= 100pi= 314mi^2 (3 s.f.)

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I NEED HELP AND YOU GUYS ARE SMART ANDBI NEED THE HELP NOW PLEASE

coldgirl [10]

Answer:

it means your adding it again lets use your example.

Step-by-step explanation:

Your increasing by 100% because 100% of 5 is 5 so your just addding 5+5 which is 10.

If you want another example tell me

Hope this helps : D

3 0

3 years ago

Read 2 more answers

Which property of equality could be used to solve x -(-6) = 18?

mote1985 [20]

Answer: subtraction property

x-(-6)=18
x+6=18
Subtract 6 from both sides
And you get x=12

4 0

3 years ago

Pam has 90 m of fencing to enclose an area in a petting zoo with two dividers to separate three types of young animals. The thre

andrew-mc [135]

Answer:

The area function is

$A=\frac{135}{2}x-\frac{9}{2}x^2$ .

The domain and range of A is $(0,15m)$ and $(0, 253.125 m^2]$ .

Step-by-step explanation:

The given length of fencing is $90 m$ .

Let the length and width of each pen be $x$ and $y$ respectively as shown in the figure.

As there are 3 pens, so, the total area,

$A= 3 xy \;\cdots (i)$

From the figure the total length of fencing is $6x+4y$ .

Here, for a significant area for the animals, $x>0$ as well as $y>0$ as $x$ and $y$ are the sides of ben.

From the given value:

$6x+4y=90\;\cdots (ii)$

$\Rightarrow y=\frac {45}{2}-\frac{3x}{2}$

Now, from equation (i)

$A=3x\left(\frac {45}{2}-\frac{3x}{2}\right)$

$\Rightarrow A=\frac{135}{2}x-\frac{9}{2}x^2\;\cdots (iii)$

This is the required area function in the terms of variable $x$ .

For the domain of area function, from equation (ii)

$x=15-\frac{2y}{3}$

$\Rightarrow x$ [as y>0]

So, the domain of area function is $(0,15m)$ .

For the range of area function:

As $x \rightarrow 0$ or $y\rightarrow 0$ , then $A\rightarrow 0$ [from equation (i)]

$\Rightarrow A>0$

Now, differentiate the area function with respect to $x$ .

$\frac {dA}{dx}=\frac{135}{2}-9x$

Equate $\frac {dA}{dx}$ to zero to get the extremum point.

$\frac {dA}{dx}=0$

$\Rightarrow \frac{135}{2}-9x=0$

$\Rightarrow x=\frac{15}{2}$

Check this point by double differentiation

$\frac {d^2A}{dx^2}=-9$

As, $\frac {d^2A}{dx^2}$ , so, point $x=\frac{15}{2}$ is corresponding to maxima.

Put this value back to equation (iii) to get the maximum value of area function. We have

$A=\frac{135}{2}\times \frac {15}{2}-\frac{9}{2}\times \left(\frac {15}{2}\right)^2$

$\Rightarrow A=253.125 m^2$

Hence, the range of area function is $(0, 253.125 m^2]$ .

4 0

4 years ago

What are these < > =???????????

madam [21]

These Are Less Than(<) and Greater Than(>) Symbols!!

Hope This Helps!!!

7 0

3 years ago

Read 2 more answers

What is the value of y in the equation, 5x+2y=20, when x=0.3

gregori [183]

Answer:

y = -5/2x + 10

Step-by-step explanation:

Step one: Add -5x to both sides.

5x + 2y + -5x = 20 + -5x

2y = -5x + 20

Step two: Divide both sides by two.

2y/2 = -5x + 20/ 2

y = -5/2x + 10

Hope my answer help.

4 0

3 years ago