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alexira [117]
4 years ago
8

A circle has a diameter of 28 meters. what is the circumference?

Mathematics
1 answer:
V125BC [204]4 years ago
8 0

Answer:

C≈87.96m

Step-by-step explanation:

just plug intogoogle .


If you were helped by my answer, remember that I worked really hard on it. Please click the [ ♥ ᴛʜᴀɴᴋs ] button below and give me a rating of ★★★★★ to show your appreciation. Also, please mark as brainliest!

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Solve using the quadratic formula. Show all work. Write each solution in simplest form. No decimals.
r-ruslan [8.4K]

Given:

The given quadratic equation is:

12a^2+9a+7=0

To find:

The solution for the given quadratic equation in simplest form by using the quadratic formula.

Solution:

Consider a quadratic equation is defined as ax^2+bx+c=0, then the quadratic formula is:

x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}

The given quadratic equation is:

12a^2+9a+7=0

We have, a=12,b=9,c=7. Using the quadratic formula, we get

x=\dfrac{-(9)\pm \sqrt{(9)^2-4(12)(7)}}{2(12)}

x=\dfrac{-9\pm \sqrt{81-336}}{24}

x=\dfrac{-9\pm \sqrt{-255}}{24}

x=\dfrac{-9\pm i\sqrt{255}}{24}              [\because \sqrt{-a}=i\sqrt{a}]

The solutions of the given equations are x=\dfrac{-9-i\sqrt{255}}{24} and x=\dfrac{-9+i\sqrt{255}}{24}.

Hence, the correct option is B.

3 0
3 years ago
What are the coordinates of the point?
kenny6666 [7]
D -2, 4 is in the second quadrant because the -x brings it to the left side and the positive 4 puts it in the upper of the left side which is the second quadrant
7 0
3 years ago
Which of the following numbers sets does not include \large -\sqrt{25} ?
kolbaska11 [484]

Answer:

Step-by-step explanation:

The answer is B

The whole numbers are the + integer set. Since -sqrt(25) = - 5, this number is not included in the whole number set.

8 0
3 years ago
What are the constants in this expression?<br> -10.6+9\10+2\5m-2.4n+3m
Annette [7]
-10.6, and 9/10, are the constants
8 0
3 years ago
Solve nonhomogenous equation: x"+4x=cost
motikmotik

Answer:

x(t) = Acos 2t + B sin 2t+\frac{cost}{3}

Step-by-step explanation:

Given is a non homogeneous second degree equation as

x"+4x=cost

Auxialary equation is

m^2+4 =0\\m = 2i, -2i

Hence general solution is

x = Acos 2t + B sin 2t

Particular integral is = \frac{cost}{D^2+4}

Since t has coefficient 1, we substitute

D^2 =-1\\PI = \frac{cost}{-1+4} =\frac{cost}{3}

Hence full solution is

x(t) = Acos 2t + B sin 2t+\frac{cost}{3}

6 0
3 years ago
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