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2 years ago

In 2016, the city of Rio de Janeiro had a population density of 5377 people/km2

Mathematics

1 answer:

Kryger [21]2 years ago

3 0

665 hon hola Que es lo q es hi

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A circle has radius 50 cm. Which of these is closer to its area?

ololo11 [35]

Answer:

the third one

Step-by-step explanation:

area of a circle is pi(r^2)

pi times 50^2 is 7853, which is closest to the third choice

4 0

3 years ago

What do you think the answer is, Hurry.

Svet_ta [14]

The answer of this problem is A because 3 times 21 is 63 and then you plus 1
which is 64

4 0

3 years ago

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What time did Katie start practicing if ate snack for 15min, watched tv for 30 min and practiced for 45 minutes

VMariaS [17]

If she ended at 6 pm.

practiced for 45 minutes. 6 pm work back 45 minutes, she started practicing at 5:15pm.

watched tv for 30 minutes. 5:15 pm work back 30 minutes, she started watching tv at 4:45 pm

ate snack for 15 minutes. 4:45 pm work back 15 minutes, she started eating her snacks at 4:30 pm.

8 0

3 years ago

4.1

Elina [12.6K]

Answer:

4.1 -

300/22= 13.65

so the answer is 13.63

4.2

distance/speed

330/110= 3

So it'll take 3 hours

4.3

sorry not sure for this one :(

7 0

3 years ago

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The equation of circle having a diameter with endpoints (-3, 1) and (5, 7) is

nydimaria [60]

The equation of a circle:
$(x-h)^2+(y-k)^2=r^2$
(h,k) - the coordinates of the center
r - the radius

The center is the midpoint of the diameter.
$(-3,1) \\
x_1=-3 \\ y_1=1 \\ \\
(5,7) \\
x_2=5 \\ y_2=7 \\ \\
\hbox{the midpoint: } (\frac{x_1+x_2}{2},\frac{y_1+y_2}{2}) \\
\frac{x_1+x_2}{2}=\frac{-3+5}{2}=\frac{2}{2}=1 \\
\frac{y_1_y_2}{2}=\frac{1+7}{2}=\frac{8}{2}=4 \\
\Downarrow \\
(1,4) \\ h=1 \\ k=4$

The radius is half the diameter, or the distance from one of the endpoints to the center.
$r=\sqrt{(x_1-h)^2+(y_1-k)^2}=\sqrt{(-3-1)^2+(1-4)^2}=\\
=\sqrt{(-4)^2+(-3)^2}=\sqrt{16+9}=\sqrt{25}=5 \\ \Downarrow \\
r^2=5^2=25$

The equation of the circle:
$\boxed{(x-1)^2+(y-4)^2=25}$

8 0

3 years ago

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