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lesantik [10]
2 years ago
5

Only need #2 plz i know the answer is B i just don’t know why

Mathematics
2 answers:
Luda [366]2 years ago
8 0

Check the picture below.

so, if we grab that sector made by UGD, like you see in the picture, we revolve it to the left-side and behind, we'll end up really with a half of a sphere, whose radius is 8.

\bf \textit{volume of a sphere}\\\\ V=\cfrac{4\pi r^3}{3}~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=8 \end{cases}\implies V=\cfrac{4\pi 8^3}{3}\implies V=\cfrac{2048\pi }{3} \\\\\\ \stackrel{using~\pi =3.14}{V=2143.57}\implies \stackrel{\textit{half of that for a semi-sphere}}{V\approx 1071.78\overline{6}}\implies \stackrel{\textit{rounded up}}{V=1071.79}

disa [49]2 years ago
6 0

The rotation about UG would generate a hemisphere of radius 8. The volume of a sphere with radius r is \dfrac43\pi r^3, so the volume of the hemisphere would be \dfrac12\cdot\dfrac43\pi 8^3\approx\dfrac{1024\cdot3.14}3\approx1071.79.

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Nat2105 [25]

Answer:

Number 4: Using Pythagoras Theorem,

\sqrt{30^2+40^2} =50

Number 5:

\sqrt{41^2-40^2}=9

3:

\sqrt{11^2+60^2} =61 It is a right triangle

4:

\sqrt{9^2+37^2} =38.09 Not a right triangle

For the last one:

\sqrt{(\sqrt{20^2+6^2})^2+6^2} =2\sqrt{118}

Rounded down (because the answer needs to be a whole number) is 21

7 0
3 years ago
The radioactive element​ carbon-14 has a​ half-life of 5750 years. A scientist determined that the bones from a mastodon had los
Arisa [49]

Therefore, the bones were 6612.5 years old at the time they were discovered.

<h3><u>Half life</u></h3>

Given that the radioactive element​ carbon-14 has a​ half-life of 5750 years, and a scientist determined that the bones from a mastodon had lost 57.5​% of their​ carbon-14, to determine how old were the bones at the time they were discovered, the following calculation must be made:

  • 50 = 5750
  • 100 = 11500
  • 57.5 = X
  • 57.5 x 11500 / 100 = X
  • 6612.5 = X

Therefore, the bones were 6612.5 years old at the time they were discovered.

Learn more about half life in brainly.com/question/24710827

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8 0
2 years ago
John bought 4 pounds of hot dogs for his party. How many ounces of hot dogs did John buy?
Sergio039 [100]
64 ounces

Because,

1 pound = 16 ounces

4 x 16 = 64 ounces.
4 0
3 years ago
Read 2 more answers
The side lengths of a triangle are 12,^149,^5. Is the triangle a right triangle?
Paladinen [302]

Answer:

no

Step-by-step explanation:

12 squared plus 5 squared=169

5 0
3 years ago
The slope of a line is -4/5 what is the rise if the run is 20?
Strike441 [17]

Answer:

rise= -16

Step-by-step explanation:

Please see the attached picture for the full solution.

6 0
3 years ago
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