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3 years ago

What is the circmference and ared of a circiewith a radius of 4 meters? round you answer to the nearest tenth

Mathematics

1 answer:

Rudik [331]3 years ago

7 0

Area: 50.3

Circumference: 25.1

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Don’t know where to start

Alenkasestr [34]

Answer:

A = 80π

Step-by-step explanation:

Area of a circle is A = πr²

Area of the the largest circle - Area of the smaller circle = the shaded part.

Largest circle - Area of the smaller circle = Shaded part of circle

A = π(12)² - A = π(8)²

144π - 64π = 80π

7 0

3 years ago

Help ill give brainliest and 5 star and thx if u help with all of em and ill give 20 points

choli [55]

Answer:

1. 3mg

2. 3050g

3. 0.025g

4. 5700mg

5. 0.294g

6. 32mg

7. 13700mg

8. 2.441kg

9. 8.24g

10. 0.075kg

11. 430g

12. 0.721g

Step-by-step explanation:

This should be right :)

3 0

3 years ago

Assume that all the given functions have continuous second-order partial derivatives. If z = f(x, y), where x = 9r cos(θ) and y

vfiekz [6]

Answer with Step-by-step explanation:

We are given that all the given functions have continuous second-order partial derivatives.

$z=f(x,y)$

Where $x=9rcos\theta,y=9r sin\theta$

We have to find

A. $\frac{\delta z}{\delta r}$

We know that

$\frac{\delta z}{\delta r}=\frac{\delta z}{\delta x}\frac{\delta x}{\delta r}+\frac{\delta z}{\delta y}\frac{\delta y}{\delta r}$

Using this formula

$\frac{\delta z}{\delta r}=9cos\theta \frac{\delta z}{\delta r}+9sin\theta\frac{\delta z}{\delta r}$

$\frac{\delta z}{\delta r}=\frac{x}{r}\frac{\delta z}{\delta r}+\frac{y}{r}\frac{\delta z}\delta y}$

B. $\frac{\delta z}{\delta \theta}$

$\frac{\delta z}{\delta \theta}=\frac{\delta z}{\delta x}\frac{\delta x}{\delta\theta }+\frac{\delta z}{\delta y}\frac{\delta y}{\delta\theta}$

$\frac{\delta z}{\delta \theta}=-9rsin\theta\frac{\delta z}{\delta x}+9rcost\theta\frac{\delta z}{\delta y}$

$\frac{\delta z}{\delta \theta}=-y\frac{\delta z}{\delta x}+x\frac{\delta z}{\delta y}$

C. $\frac{\delta^2 z}{\delta r\delta\theta}$

$\frac{\delta^2 z}{\delta r\delta\theta}=-9sin\theta\frac{\delta z}{\delta x}-y\frac{\delta^2z}{\delta x^2}(9cos\theta)+9 cos\theta\frac{\delta z}{\delta y}+x\frac{\delta^2z}{\delta y^2}(9sin\theta)$

$\frac{\delta^2 z}{\delta r\delta\theta}=-9sin\theta\frac{\delta z}{\delta x}-(81rsin\theta cos\theta)\frac{\delta^2z}{dx^2}+9cos\theta\frac{\delta z}{\delta y}+(81r cos\theta sin\theta)\frac{\delta^2z}{\delta y^2}$

$\frac{\delta^2 z}{\delta r\delta\theta}=-\frac{y}{r}\frac{\delta z}{\delta x}-\frac{xy}{r}\frac{\delta^2}{\delta x^2}+\frac{x}{r}\frac{\delta z}{\delta y}+\frac{xy}{r}\frac{\delta^2z}{\delta y^2}$

3 0

3 years ago

231 ( 40 + 15 ) = 231 x 40 + ------------ x -----------<br><br> which property is this

a_sh-v [17]

Answer:

12705

Step-by-step explanation:

The problem could be solved in two different methods:

231×(55)=12705

231×40+231×15=9240+3465=12705

6 0

2 years ago

The Coffee Spot recently served 12 pastries, including 3 bran muffins. Considering this data, how many of the next 16 pastries s

Goshia [24]

Answer:

Number of bran m muffins in 16 pastries = 4 bran muffins

Step-by-step explanation:

Given:

Total number of pastries = 12

Bran muffins (Include) = 3

Find:

Number of bran m muffins in 16 pastries.

Computation:

⇒ Ratio of bran muffins to total pastries = 3 / 12

⇒ Ratio of bran muffins to total pastries = 1 / 4

⇒ Ratio of bran muffins to total pastries = 0.25

Number of bran m muffins in 16 pastries = Number of total pastries × Ratio of bran muffins to total pastries

⇒ Number of bran m muffins in 16 pastries = 16 × 0.25

⇒ Number of bran m muffins in 16 pastries = 4 bran muffins

3 0

3 years ago