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3 years ago

Need help plz help me out thanks!

Mathematics

2 answers:

Elden [556K]3 years ago

6 0

Answer:

I hope this helps!

Step-by-step explanation:

3y(5x+3)=15yx+9y

2y(2x+3)=4yx+6y

4y(x+2)=4yx+8y

3y(7x+2)=21yx+6y

Elina [12.6K]3 years ago

5 0

Answer:

1. 15xy + 9y

2. 4xy + 6y

3. 4xy + 8y

4. 21xy + 6y

Step-by-step explanation:

You just have to expand it:

3y(5x+3)

= 3y(5x) + 3y(3)

= 15xy + 9y

2y(2x+3)

= 2y(2x) + 2y(3)

= 4xy + 6y

4y(x+2)

= 4y(x) + 4y(2)

= 4xy + 8y

3y(7x+2)

= 3y(7x) + 3y(2)

= 21xy + 6y

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3 years ago

The sector COB is cut from the circle with center O. The ratio of the area of the sector removed from the whole circle to the ar

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Answer:

$Ratio = \frac{R^2 - r^2 }{ r^2}$

Step-by-step explanation:

Given

See attachment for circles

Required

Ratio of the outer sector to inner sector

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$A_1 = \frac{\theta}{360}\pi r^2$

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2 years ago

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aliina [53]

Answer:

$(x-1)^2+(y-2)^2=6.25$

Step-by-step explanation:

The equation for a circle is given by:

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

Where (h,k) is the center and r is the radius.

The center is the red dot, which is (1,2). Thus, h=1 and k=2.

To find the radius, you need to use the distance formula. We are given two coordinates: the center (red dot) at (1,2) and a blue dot on the circle at (2.5,4). Find the radius by using the distance formula:

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

Let (1,2) be x₁ and y₁ and let (2.5,4) be x₂ and y₂. Therefore:

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Thus, r is 2.5.

Plugging these numbers into the equation, we have:

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3 0

3 years ago