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larisa86 [58]
3 years ago
10

Write the equation in standard form of a circle with center (-3,6), tangent to the y-axis.

Mathematics
1 answer:
Romashka-Z-Leto [24]3 years ago
8 0

Answer:

(x+3)^2+(y-6)^2=9

Step-by-step explanation:

The equation of a circle in standard form is written as

(x-a)^2+(y-b)^2=r^2

where

(a, b) are the coordinates of the center

r is the radius of the circle

In this problem, the circle is centered at (-3,6), so we have

a = -3

b = 6

Also, we know that the circle is tangent to the y-axis, and the x-coordinate of its center is 3: this means that the horizontal distance between the point of the circle tangent to the y-axis and the centre of the circle is 3, therefore the radius of the circle is 3.

So, the equation of this circle is:

(x-(-3))^2+(y-6)^2=3^2

(x+3)^2+(y-6)^2=9

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5(5 + x) = 6(6 + 4) ← distribute and simplify both sides

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25 + 5x = 60 ( subtract 25 from both sides )

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4 0
3 years ago
The length of a rectangle is increasing at a rate of 6 cm/s and its width is increasing at a rate of 5 cm/s. When
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Answer:

The area of the rectangle is increasing at a rate of 84 square centimeters per second.

Step-by-step explanation:

The area for a rectangle is given by the formula:

A=w\ell

Where <em>w</em> is the width and <em>l</em> is the length.

We are given that the length of the rectangle is increasing at a rate of 6 cm/s and that the width is increasing at a rate of 5 cm/s. In other words, dl/dt = 6 and dw/dt = 5.

First, differentiate the equation with respect to <em>t</em>, where <em>w</em> and <em>l</em> are both functions of <em>t: </em>

\displaystyle \frac{dA}{dt}=\frac{d}{dt}\left[w\ell]

By the Product Rule:

\displaystyle \frac{dA}{dt}=\frac{dw}{dt}\ell +\frac{d\ell}{dt}w

Since we know that dl/dt = 6 and that dw/dt = 5:

\displaystyle \frac{dA}{dt}=5\ell + 6w

We want to find the rate at which the area is increasing when the length is 12 cm and the width is 4 cm. Substitute:

\displaystyle \frac{dA}{dt}=5(12)+6(4)=84\text{ cm}^2\text{/s}

The area of the rectangle is increasing at a rate of 84 square centimeters per second.

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3 years ago
A family buys 5 airline tickets online. The family buys travel insurance that costs $19 per ticket. The
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Answer:

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19*5 = 95

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The price of one ticket is $164.

Hope this helps. Have a nice day.

8 0
2 years ago
Read 2 more answers
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Answer:

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Step-by-step explanation:

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