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Mariana [72]
1 year ago
5

I can send the other options? I just need this explained?

Mathematics
1 answer:
OLEGan [10]1 year ago
3 0

The standard equation of a circle is given by:

(x-h)^2+(y-k)^2=r^2

where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle.

For:

\begin{gathered} (x+3)^2+(y+1)^2=16 \\  \end{gathered}

Rewrite the equation as:

\begin{gathered} (x-(-3))^2+(y-(-1))^2=4^2 \\ so\colon \\ h=-3 \\ k=-1 \\ r=4 \end{gathered}

We can conclude it is a circle with center at (-3,-1) and radius of 4

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A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?.
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<h3>What is the distance?</h3>

Distance is defined as the product of speed and time.

Given that A train 360 m long is running at a speed of 45 km/hr.

Speed of train = 45 km/hr.

And it passes a bridge 140 m long.

Length of train = 360 meters

Since 1 km = 1000 meters.

and 1 hour = 3600 seconds

we have to determine the length of the train

So 1(km/hr.) = (1000/3600) = (26/72) meter/seconds

45 km/hr = 45 ×5/18 = 25/2 meter per second

So the speed of the train = 25/2 meters per second

Total distance to be covered = (360+140)m = 500m.

So time will it pass a bridge = distance/speed

Substitute the values of distance and speed in the above formula,

⇒ 500/(25/2)

⇒ 500×2/25

⇒ 40 seconds

Hence, the train will pass a bridge in 40 seconds.

Learn more about the distance here:

brainly.com/question/13269893

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