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4 years ago

9

Helllllllllllllppppppppppppppp!!!!!!!!!!

1 answer:

Zanzabum4 years ago

4 0

<span>If the ellipse is vertical, then the answer is (x² / 4) + (y² / 25) = 1.
</span>I hope this helps :)

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A gardener uses 1\3 of liter of water to water 2\7 of the garden

andrew11 [14]

The answer is 13 because you add.

4 0

4 years ago

Answer this question

Natasha2012 [34]

Answer:

A and B

Step-by-step explanation:

This is a geometric sequence, because each number in the sequence is multiplied by another number to get the next number.

The common ratio is 2, because each number is multiplied by 2 to get the next number

1*2=2

2*2=4

4*2=8

Hope this helps! :)

5 0

4 years ago

Read 2 more answers

A sphere has a surface area of 36π ft2. Find the volume of the sphere.

Stella [2.4K]

The surface area of the sphere is given by the equation

$A=4\pi * r^{2}$ ,

where A is the surface area and r is the radius.

We want to find the volume of the sphere, which is given by the equation

$V = \frac{4}{3} * \pi * r^{3}$ ,

where V is the volume and r is the radius.

Looking at these equations, we see that they both involve the sphere's radius. If we know what r is, we can calculate the volume.

We know that the sphere's surface area is $36 \pi$ . Plugging that in for A in the surface area equation, we get

$36 \pi=4\pi * r^{2}$ , then divide by $\pi$

$36 = 4 * r^{2}$ , then divide by 4

$r^{2} = 9$ , then take the square root of both sides

$r = 3$

So the radius of the sphere is 3. Plugging this into the volume equation,

$V = \frac{4}{3} * \pi * 3^{3}$ , simplify terms

$V = \frac{4}{3} * \pi * 27$ , multiply $\frac{4}{3}$ by 27

$V = 36 * \pi$

So the volume of the sphere is $36\pi$ .

6 0

4 years ago

Read 2 more answers

Which expression is equivalent to 5x+10y-15?

Papessa [141]

Answer:

Step-by-step explanation:

I think it's 5(x+2y-3)

5 0

3 years ago

A new post-surgical treatment is being compared with a standard treatment. Seven subjects receive the new treatment, while seven

a_sh-v [17]

Answer:

$(17.714-28.714) -2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -19.745$

$(17.714-28.714) +2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -2.255$

Step-by-step explanation:

For this case we have the following info given:

Treatment: 12 13 15 19 20 21 24

Control: 18 23 24 30 32 35 39

We can find the sample mean and deviations with the the following formulas:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

$s =\sqrt{\frac{\sum_{i=1}^n (X_i- \bar X)^2}{n-1}}$

And repaplacing we got:

$\bar X_T = 17.714$ the sample mean for treatment

$\bar X_C = 28.714$ the sample mean for treatment

$s_T= 4.461$ the sample deviation for treatment

$s_C= 7.387$ the sample deviation for control

$n_T= n_C= 7$ the sample size for each sample

The degrees of freedom are given by:

$df= 7+7-2= 12$

The confidence interval for the difference of means is given by:

$(\bar X_T -\bar X_C) \pm t_{\alpha/2} \sqrt{\frac{s^2_T}{n_T} +\frac{s^2_C}{n_C}}$

The confidence is 98% so then the significance is $\alpha=0.02$ and $\alpha/2 =0.01$ . Then the critical value would be:

$t_{\alpha/2}=2.681$

And replacing we got:

$(17.714-28.714) -2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -19.745$

$(17.714-28.714) +2.681 \sqrt{\frac{4.461^2}{7} +\frac{7.387^2}{7}}= -2.255$

4 0

4 years ago