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svp [43]
4 years ago
10

What is the area of a cirlcle that's 4cm ​

Mathematics
1 answer:
Elena-2011 [213]4 years ago
7 0
If the radius of the circle is 4 than the area would be 50.27.

If you are saying that 4 is the diameter, than divide that by 2 to get the radius which is 2. The area for this would be 12.57.

I don’t know which one you mean but hope this helps :))
You might be interested in
A function f is given by the formula f(x)=a⋅ekx for constants a and k. we also know that f(4)=12 and f(7)=5. find numerical valu
masha68 [24]

The given function is

f(x) = a e^{kx}

And it is given that f(4)=12

On using this information, we will get

12 = a e^{4k}

And the other point is f(7)=5

Using this point, we will get

5= ae^{7k}

Dividing both equations, we will get

\frac{12}{5} = e^{4k-7k}

Taking ln to both sides

ln( \frac{12}{5} ) = -3k

k = -0.29

Performing back substitution ,

12 = a e^{-0.29*4}
\\
a =38.28

3 0
4 years ago
Solve for a: 5(a+5)-3=3(2-a)
ivann1987 [24]

Simplify:

5(a + 5) + -3 = 3(2 + -1a)

Reorder the terms:

5(5 + a) + -3 = 3(2 + -1a)

(5 * 5 + a * 5) + -3 = 3(2 + -1a)

(25 + 5a) + -3 = 3(2 + -1a)

Reorder the terms again:

25 + -3 + 5a = 3(2 + -1a)

Combine like terms:

]25 + -3 = 22

22 + 5a = 3(2 + -1a)

22 + 5a = (2 * 3 + -1a * 3)

22 + 5a = (6 + -3a)

Solve:

22 + 5a = 6 + -3a

To solve for variable 'a':

You have to move all terms containing A to the left, all other terms to the right.

Then add '3a' to each side of the equation:

22 + 5a + 3a = 6 + -3a + 3a

Combine like terms:

5a + 3a = 8a

22 + 8a = 6 + -3a + 3a

Combine like terms again:

-3a + 3a = 0

22 + 8a = 6 + 0

22 + 8a = 6

Add '-22' to each side of the equation.:

22 + -22 + 8a = 6 + -22

Combine like terms:

22 + -22 = 0

0 + 8a = 6 + -22

8a = 6 + -22

Combine like terms once more:

6 + -22 = -16

8a = -16

Divide each side by '8'.

a = -2

Simplify:

a = -2

Answer: a=-2

Hope I could help! :)

8 0
3 years ago
Read 2 more answers
please help now it kinda important i get it done soon or i cant go to a dance for my school tomorrow. im begging u ill give u 5
Tasya [4]
Four apples.

Fifty percent - or half - of eight is four
8 0
2 years ago
Please, I need help on this problem
MrMuchimi
Anyone sees the problem? I can’t see it.
5 0
3 years ago
Tom wants to paint a rectangular wall that measures 16 feet by 9 feet. The wall contains a window with the dimensions shown. If
ollegr [7]
A because 16x9=144 and 4x6=24 and 144-24=120
3 0
3 years ago
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