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3 years ago

Find the area and circumference of a circle with radius 2 cm use 3.14 for pie do not round answers

Mathematics

1 answer:

Vlad1618 [11]3 years ago

3 0

Answer:

The area is 12.56, and the circumference is 12.56.

Step-by-step explanation:

For the area,

We need to use the formula A=3.14*radius*radius

So we plug it in, and we get 3.14*2*2, which is 12.56 centimeters squared.

For circumference, we need to do,

C = 3.14*diameter

To find the diameter we need to do 2 (radius) x 2 which is 4

Plugging it in that would be 3.14 * 4 which is 12.56

So, in this case, the area is 12.56, and the circumference is also 12.56.

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Mazyrski [523]

Answer:

Step-by-step explanation:

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3 years ago

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Sara was thinking of a number. Sara subtracts 9 from it and gets an answer of 0.4. What was the original number?

Dmitrij [34]

Answer:

-8.6

Step-by-step explanation:

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3 years ago

Please help meeeeeeeeeeeeeeeee please

Harman [31]

9514 1404 393

Answer:

2.1 ft³

Step-by-step explanation:

Put the given radius and height into the volume formula and do the arithmetic.

V = 1/3πr²h

V = 1/3(3.14159)(1 ft)²(2 ft) ≈ 2.094 ft³

Rounded to tenths, this is 2.1 cubic feet.

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4 0

3 years ago

The light intensity I (in lumens) at a depth of x feet in Lake Elizabeth is given by the formula log (StartFraction Upper I Ove

antiseptic1488 [7]

Answer:

The light intensity at a depth of 24 feet is 3.0143 lumens.

The light intensity will be 7 lumenus at the depth of 9.3732 feet approximately.

Step-by-step explanation:

Consider the provided formula.

$log(\frac{I}{12})=-0.025x$

Where I is the intensity of light and x is the depth.

Part (A) Find the light intensity at a depth of 24 feet.

Substitute x=24 in above formula.

$log(\frac{I}{12})=-0.025(24)$

$log(\frac{I}{12})=-0.6$

$\frac{I}{12}=10^{-0.6}$

$\frac{I}{12}=0.2512$

$I=3.0143$

Hence, the light intensity at a depth of 24 feet is 3.0143 lumens.

Part (B) At what depth is the light intensity 7 lumens

Substitute I=7 in above formula.

$log(\frac{7}{12})=-0.025x$

$-0.23433=-0.025x$

$0.23433=0.025x$

$x=\frac{0.23433}{0.025}$

$x=9.3732$

Hence, the light intensity will be 7 lumenus at the depth of 9.3732 feet approximately.

3 0

3 years ago

please only answer if you're a hundred percent sure you know the correct answer and please answer all question

Alika [10]

Answer:

Q.no.1

d=1 then t=7

d=3 then t=11

t=15 then d=5

Q.no.2

d=1 then t=3

d=3 then t=9

t=15 then d=5

Q.no.3

5x = 12+18

or, 5x = 30

or, x =30/5

or, x = 6

Q.no.6

x < 8

Q.no.7

x >_ 7 ( option d)

Hope it helps.

8 0

3 years ago