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3 years ago

A circle has a diameter of 4 m.

Mathematics

2 answers:

Margaret [11]3 years ago

7 0

A= π r ²

Take half of the diameter for the radius, so the radius is 2m

A=π 2 ²

A= 12.57 m²

So, yes, you are correct

Sergio [31]3 years ago

3 0

Answer: 12.56 is your answer I took the test Im serious

Have a great day

Can I get brainliest pls

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Find the inverse of the function. y = x2 + 4x + 4

Eddi Din [679]

Answer:

y = -2+ $\sqrt{x}$ and y = -2 - $\sqrt{x}$ combined, or $x = y^2 + 4y + 4$

Step-by-step explanation:

$y = x^2 + 4x + 4$

substitute y for x and x for y

$x = y^2 + 4y + 4$

this is technically the inverse but I will simplify further

x = $(y+2)^2$

± $\sqrt{x}$ = y+2

y = -2± $\sqrt{x}$

y = -2+ $\sqrt{x}$ and y = -2 - $\sqrt{x}$ combined

7 0

3 years ago

Read 2 more answers

2х5y-3z-=14 x-2y+=-12 -x+ Зу-2z =13

lukranit [14]

Answer:

x = -34/3, y = 1/3, and z = -35/3

Step-by-step explanation:

2х+5y-3z-=14 let's call this equation 1.

x-2y=-12 let's call this equation 2.

-x+Зу-2z =13 let's call this equation 3.

USING EQUATION 1 AND EQUATION 3.

2х+5y-3z-=14 (EQUATION 1)

-x+Зу-2z =13 (EQUATION 3)

LET'S GET RID OF z, BY MAKING THE COEFFICIENT OF z IN THE TWO EQUATION THE SAME. WE WILL MULTIPLY EQUATION 1 BY 2 AND EQUATION 3 BY 3.

2х+5y-3z-=14 (EQUATION 1) * 2

-x+Зу-2z =13 (EQUATION 3) * 3

4х+10y-6z-=28 let's call this equation 4.

-3x+9у-6z =39 let's call this equation 5.

TO GET RID OF z, WE WILL HAVE TO SUBTRACT EQUATION 5 FROM EQUATION 4 PLEASE TAKE NOTE OF THE SIGNS (-) (+).

4х+10y-6z-=28 (EQUATION 4)

- (-3x+9у-6z =39) (EQUATION 5)

(4x - 3x) + ((+10y) - (+9y)) + ((-6z) - (-6z)) = (28 - 39)

x + y + 0 = -11

x + y = -11 let's call this equation 6.

USING EQUATION 2 AND EQUATION 6, LET'S FIND x AND y.

x-2y=-12 (EQUATION 2)

x + y = -11 (EQUATION 6)

x has the same coefficient in both equations, which is 1. Let's get rid of x so we can find the value of y.

We will subtract equation 6 from equation 2. Take note of the signs.

x-2y=-12 (EQUATION 2)

- (x + y = -11) (EQUATION 6)

(x - x) + ((-2y) - (+y)) = ((-12) - (-11))

0 + -3y = -1

-3y = -1

Divide both sides by -3.

-3y/-3 = -1/-3

y = 1/3

LET'S SUBSTITUTE THE VALUE OF y INTO EQUATION 2 TO GET THE VALUE OF x.

x-2y=-12 (EQUATION 2)

x-2(1/3)=-12

x -2/3 = -12

Add 2/3 to both sides.

x -2/3 + (2/3) = -12 + (2/3)

x + 0 = -34/3

x = -34/3

LET'S SUBSTITUTE THE VALUES OF x and y INTO EQUATION 1 TO GET THE VALUE OF z.

2х+5y-3z-=14 (EQUATION 1)

2(-34/3)+5(1/3)-3z-=14

-68/3 + 5/3 - 3z = 14

-21 - 3z = 14

Add 21 to both sides.

-21 + (21) - 3z = 14 + (21)

0 - 3z = 35

-3z = 35

Divide both sides by -3.

-3z/-3 = 35/-3

z = -35/3 or

Therefore, x = -34/3, y = 1/3, and z = -35/3

Please thank, rate 5 stars, and give brainliest. Thank you.

6 0

3 years ago

You can use a calculator for this question.

DochEvi [55]

1) Width = 7.35/2.1 = 3.5 m

2) C = 7pi = 21.98 m

8 0

3 years ago

Read 2 more answers

85 points and brainiest

Norma-Jean [14]

The line would lie on the same line as original but it will be 1/2 the length

3 0

3 years ago

What are the dimensions of the matrix?

dusya [7]

The dimension of a matrix is the no of rows by the no of columns.

Here there are two rows and five column. So the dimensions of the matrix is 2 x 5

6 0

4 years ago