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ella [17]
3 years ago
11

Find the area of a circle with a radius of 3

Mathematics
2 answers:
ExtremeBDS [4]3 years ago
7 0

Answer: 28.27

Step-by-step explanation: first multiply the radius by itself 3 times 3 = 9

then take 9 and multiply it by 3.14 which is 28.27

hope this helps mark me brainliest

Aleks04 [339]3 years ago
3 0

Step-by-step explanation:

So to find the area of a circle, you have to use this formula:

A = 3.14r^2

So just plug everything in like this:

A = 3.14 * 3^2

Then solve

A = 3.14 * 9

Answer:

Area is = 28.26 units^2

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Airida [17]

Answer:

150 students.

No

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Step-by-step explanation:

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The next one says that he drilled a hole that is 5/9 inches wide. He has a drill bit that is 5/6. Will the drill bit be big enough. No because 5/9 is .556 and 5/6 is .833.

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8 0
3 years ago
If the radius of a sphere is halved, what happens to the volume of the sphere? Use your algebra skills to develop a formula for
valkas [14]
Since V = (4/3) * pi * R^3

If R is halved, V' will reduce by a ratio of (1/2)^3 = 1/8

So V' = (1/8)V
4 0
3 years ago
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A candy store called "Sugar" built a giant sugar cube out of wood to hang above the entrance to their store. It took 545454 feet
DedPeter [7]

Answer:

<em>The volume inside the giant sugar cube is 27 cubic feet.</em>

Step-by-step explanation:

It took 54 feet² of material to build the giant sugar cube. That means, the total surface area of the cube is 54 feet²

<u>Formula for surface area of a cube</u> is:  S= 6a^2 , where a is the length of each edge of the cube.

So, we will get.........

6a^2=54\\ \\ a^2= \frac{54}{6}=9 \\ \\a= \sqrt{9}= 3

Now, <u>the volume of the cube will be</u>:  V= a^3= (3)^3 = 27 feet³

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3 0
3 years ago
Which expression is equivalent to...? Screenshots attached, please help.
BaLLatris [955]

For this case we must simplify the following expression:

\sqrt [3] {64 * a ^ 6 * b ^ 7 * c ^ 9}

We rewrite:

64 = 4 ^ 3\\a ^ 6 = (a ^ 2) ^ 3\\b ^ 6 * b = ((b ^ 2) ^ 3 * b)\\c ^ 9 = (c ^ 3) ^ 3

So:

\sqrt [3] {4 ^ 3 * (a ^ 2) ^ 3 * (b ^ 2) ^ 3 * b * (c ^ 3) ^ 3} =\\\sqrt [3] {4 * a ^ 2 * b ^ 2 * c ^ 3) ^ 3 * b} =

By definition of properties of powers and roots we have:

\sqrt [n] {a ^ m} = a ^ {\frac {m} {n}}

So:

4a ^ 2b ^ 2 c ^ 3 \sqrt [3] {b}

Answer:

Option B

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{[14-2×3]-[18÷(12-3)]}+{42-11×3+[(65-9×5)+3]}
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Use Bidmas, solve all the inner brackets (), with first division, then multiplication then addition then subtraction
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