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____ [38]
3 years ago
10

Which expression is equivalent to

Mathematics
1 answer:
Finger [1]3 years ago
7 0
The answer would be A. because two negatives equal a positive
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{8} ⊆ {7,8,9} true or false
Natalija [7]

the answer is false

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6 0
3 years ago
Read 2 more answers
Work out the ratio of the volume of the sphere to the volume of the cylinder
N76 [4]

so we know the radius of the sphere is 8, and its surface area is 4πr², therefore its surface area is 4π8², namely 256π.


we also know that the surface area of the cylinder is half that of the sphere, namely 256π/2 or 128π, let's use that surface area to get the height h.


\bf \textit{total surface area of a cylinder}\\\\ SA=2\pi r(h+r)~~ \begin{cases} r=4\\ SA=128\pi  \end{cases}\implies 128\pi =2\pi (4)(h+4) \\\\\\ 128\pi =8\pi(h+4)\implies \cfrac{128\pi }{8\pi }=h+4\implies 16=h+4\implies \boxed{12=h}


since now we know h and r for the cylinder, and we also know r for the sphere, let's check their volume's ratio.


\bf \begin{array}{|c|ll} \cline{1-1}\\ \textit{volume of a sphere}\\\\ V=\cfrac{4\pi r^3}{3}\\\\ \textit{volume of a cylinder}\\\\ V=\pi r^2 h\\\\ \cline{1-1} \end{array}~\hspace{3em}\cfrac{~~\frac{4\pi 8^3}{3}~~}{\pi (4)^2(12)}\implies \cfrac{~~\frac{2048\pi }{3}~~}{192\pi } \\\\\\ \cfrac{2048\pi }{3}\cdot \cfrac{1}{192\pi }\implies \cfrac{32}{9}

8 0
3 years ago
What is the area of this shape ?
RUDIKE [14]

12 *16 = 192

1/2 *20*10 = 100

192 +100 = 292 square units

8 0
3 years ago
Pls help due today I will Give crown
bezimeni [28]

Answer: C

Step-by-step explanation:

Crown?

6 0
3 years ago
the company profits increase 20% from last year. if the profits last year were $2,500 what are the company's profits this year.
Hunter-Best [27]
The profits this year are $3000. found by $2500×1.2
7 0
4 years ago
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