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3 years ago

13

Find the value of A when pi= 3.142 and r= 5

1 answer:

guapka [62]3 years ago

7 0

Answer:

7.855

Step-by-step explanation:

A=pi*r^2=3.142*5^2=3.142*25=7.855

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An ellipse has a center at the origin, a vertex along the major axis at (0, 17), and a focus at (0, −8). Which equation represen

Marianna [84]

We know that
<span>Since the focus and vertex are above and below each other, rather than side by side, I know that this ellipse must be taller than it is wide.
</span>Then
a²<span> will go with the </span>y<span> part of the equation
</span>Also, since the focus is 8 <span>units below the center, then </span><span>c = 8
</span>since the vertex is 17<span> units above, then </span><span>a = 17
</span>The equation b²<span> = a</span>²<span> – c</span>²<span> gives me
</span>b²=17²-8²-----> b²=225
the equation is
y²/a²+x²/b²=1------> y²/289+x²/225=1

the answer is
y²/289+x²/225=1

see the attached figure

7 0

3 years ago

Read 2 more answers

Find the distance between the points (0,-2) and (-8,-8)

Ostrovityanka [42]

Answer:

Distance between the points = 10 units

Step-by-step explanation:

Given points:

(0,-2) and (-8,-8)

To find the distance between the two points.

Solution:

Applying distance formula to find the distance between the points.

For points $(x_1,y_1)$ and $(x_2,y_2)$ the distance is given as:

$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

Plugging in the given points in the formula.

$d=\sqrt{(-8-0)^2+(-8-(-2))^2}$

$d=\sqrt{(-8)^2+(-8+2))^2}$

$d=\sqrt{(-8)^2+(-6)^2}$

$d=\sqrt{64+36}$

$d=\sqrt{100}$

$d=\pm10$

Since distance is always positive. So $d=10$ units.

3 0

3 years ago

There are 12 men and 24 women in a chorus. What percent of the entire chorus is composed of women?

kati45 [8]

About 66 percent.
Because 24/36 are women, keep simplifying that divide by 6, 4/6, divide by 2, 2/3 = 0.66 = 66%.

7 0

3 years ago

WILL GIVE BRAINLIEST TO THE BEST ANSWER!!!! The graph below shows the price, y, in dollars, of different amounts of granola, x,

Vera_Pavlovna [14]

Well this one is very simple. It seems to give 1 lb per 4 dollars spent. So, the best way to state this mathematically is x=4y or x=4×y.

8 0

3 years ago

A circle is centered on point B. Points A, C and D lie on its circumference.

IRISSAK [1]

Given:

A circle is centered on point B.

Points A, C and D lie on its circumference.

If $m\angle ABC$ measures 40°.

To find:

The $m\angle ADC$ .

Solution:

Central angle theorem: According to this theorem, the central angle is equal to the twice of inscribed angle on the same intercepted arc.

In the given figure $\angle ABC$ is the central angle and $m\angle ADC$ is the inscribed angle on the same arc AC.

Using central angle theorem, we get

$m\angle ABC=2m\angle ADC$

$40^\circ=2m\angle ADC$

$\dfrac{40^\circ}{2}=m\angle ADC$

$20^\circ=m\angle ADC$

Therefore, the measure of angle ADC is 20°.

3 0

2 years ago