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3 years ago

the radius of a circle is doubled. a . how does the circumference change? b. How does the area change?

Mathematics

1 answer:

yaroslaw [1]3 years ago

5 0

Let's say the original radius was "r", so the circumference is 2πr and the area is πr².

Now when you double the radius, the you get a new circle with radius 2r, circumference 2π(2r) = 4πr, and area π(2r)² = 4πr².

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Gekata [30.6K]

Answer:

the 1 one

Step-by-step explanation:

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3 years ago

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Elan Coil [88]

Answer:

The values for the given function f is defined by $f(x)=\frac{1}{2}x$ is

a) $f(0)=0$ ,

b) $f(18)=9$ and

c) $f(-18)=-9$

Step-by-step explanation:

Given that the function f is defined by $f(x)=\frac{1}{2}x$

Now to find the value of f(0), f(18) and f(-18)

Now take f(0)

Put x=0 in the given function $f(x)=\frac{1}{2}x$ we get

$f(0)=\frac{1}{2}(0)$

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Put x=18 in the given function $f(x)=\frac{1}{2}x$ we get

$f(18)=\frac{1}{2}(18)$

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Therefore $f(18)=9$

Put x=-18 in the given function $f(x)=\frac{1}{2}x$ we get

$f(-18)=\frac{1}{2}(-18)$

$=-9$

Therefore $f(-18)=-9$

The values for the given function f is

a) $f(0)=0$ ,

b) $f(18)=9$ and

c) $f(-18)=-9$

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3 years ago

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A football field is about 100 m long. if it takes a person 20 second to run its length, how fast ( what speed) were they running

rodikova [14]

I belive it's 5.
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Because it's Distance divided by Time, because your finding speed.

8 0

4 years ago

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jok3333 [9.3K]

Answer:

x = 6, y = -5.

Step-by-step explanation:

6x + 8y = -4

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y = 10/-2 = -5,

Plug this into the second equation:

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-6x = 14 - 50 = -36

x = -36/-6

x = 6.

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3 years ago

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galben [10]

Answer:

Vijay cannot fit all the cubes into the box, he can only fit 20 cubes into the box

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3 years ago