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2 years ago

Please help, I really need to know how to do it

Mathematics

2 answers:

docker41 [41]2 years ago

7 0

Answer: It is roughly 25.12 or 8π

Step-by-step explanation:

Well, it depends if you are using 3.14 as a subsitute for Pi, or you are just using the Pi symbol (π). Let me explain better:

The equation for solving the circumference of a circle is C=2πr

R is the radius, which is the 4 in the problem. If you were just using the Pi symbol, you would multiply 2*4 because you plugged 4 into the equation above. This would result in C=8π.

If you were using 3.14, you would subsitute both 3.14 and 4. So it would be C=2(3.14)(4) which would be 25.12

Hope this helped! (By the way, if it is wrong, I have not gotten this in my math class yet). ALSO remember to check whether the homework is using 3.14 for Pi or you just using the Pi symbol. And to put the squiggly equation symbol which means about.

nirvana33 [79]2 years ago

4 0

Answer:

So heres what I think

C=2pie r

C=2*3.14*4

c=25.12

So basically half the circle is the radius and the whole is the circumference. So what you are doing is changing pie to 3.14 (since pie=3.14), since half the circle its radius so all you have to do is 2 times 3.14 times 4 to get 25.12 as your circumference.

Hope this helps!

Step-by-step explanation:

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3 years ago

How can we factorise the expression: 2x^6+17x^3+8?

LekaFEV [45]

Answer:

$(a + 2)( {a}^{2} - 2a + 4 )(2 {x}^{ 3} + 1)$

Step-by-step explanation:

$2x^6+17x^3+8 \\ = 2x^6+16x^3 + {x}^{3} +8 \\ = 2{x}^{3} ( {x}^{3} + 8) + 1( {x}^{3} + 8) \\ = ( {x}^{3} + 8)(2 {x}^{ 3} + 1) \\ = ( {x}^{3} + {2}^{3} )(2 {x}^{ 3} + 1) \\ = (a + 2)( {a}^{2} - 2a + {2}^{2} )(2 {x}^{ 3} + 1) \\ = (a + 2)( {a}^{2} - 2a + 4 )(2 {x}^{ 3} + 1) \\$

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4 years ago

Factor (z-5)(z+4)=52

Ipatiy [6.2K]

Good Afternoon! Here is your answer step by step!

Let's solve your equation step-by-step.

(z−5)(z+4)=52

Step 1: Simplify both sides of the equation.

z2−z−20=52

Step 2: Subtract 52 from both sides.

z2−z−20−52=52−52

z2−z−72=0

Step 3: Factor left side of equation.

(z+8)(z−9)=0

Step 4: Set factors equal to 0.

z+8=0 or z−9=0

z=−8 or z=9

Answer:

z=−8 or z=9

Have a blessed day! ❤

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3 years ago

What number round to 200.000 when rounded to the nearest hundred thousand? Choose all that apply

Anuta_ua [19.1K]

Answer:

Is there multiple choice to this question?

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3 years ago

A ball has a radius of 8 cm. What is the volume of the ball? Use 3.14 for pie Round your answer to the nearest tenth of a cubic

AveGali [126]

The volume of the ball is 33.5 cubic centimeter.

<u>Step-by-step explanation:</u>

It is given that, a ball has a radius of 8 cm.

We know that, the ball is in shape of the sphere.

The question is asked to find the volume of the ball.

To find the volume of the ball, you need to use the formula for volume of the sphere.

Volume of the sphere = (4/3)πr³

where,

π has the default value of 3.14
r is the radius of the ball.

Volume of the ball = (4/3)× 3.14× 8

⇒ 33.49

⇒ 33.5 (rounded to the nearest tenth)

⇒ 33.5 cubic centimeter.

∴ The volume of the ball is 33.5 cubic centimeter.

6 0

3 years ago