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erik [133]
3 years ago
13

The radius of a sphere measures 2 units. What is its surface area? S = 4nr2 S = 4n(2)2 Surface area = 16 square units​

Mathematics
1 answer:
garri49 [273]3 years ago
6 0

Answer:

50.24 sq. units

Step-by-step explanation:

S = 4πr² = 4×3.14× 2² = 3.14 × 16 = 50.24 sq. units

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Answer:

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jeyben [28]

Answer:

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Step-by-step explanation:

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2 years ago
What is the height of the cone below?
melisa1 [442]

The formula of a volume of a cone:

V=\dfrac{1}{3}Bh[/rex]B - area of a baseh - heightWe have[tex]V=90\ cm^3,\ B=18\ cm^2

Substitute:

90=\dfrac{1}{3}\cdot18\cdot h\\\\90=6h\qquad|\text{divide both sides by 6}\\\\15=h\to h=15

<h3>Answer: 15 cm.</h3>
3 0
3 years ago
Ava and Kelly ran a road race, starting from the same place at the same time. Ava ran at an average speed of 6 miles per hour. K
zalisa [80]
<h2>Hello!</h2>

The answer is:

It will took 0.375 hours for Ava and Kelly to be 3/4 miles apart.

<h2>Why?</h2>

To calculate how long after they start they will be 3/4 miles apart, we need to write two equations.

So, writing the equations, we have:

Calculations for Ava:

We have the following information,

v_{Ava}=6mph

Then, writing the equation,

x_{Ava}=x_{o}+v_{Ava}*t

x_{Ava}=x_{o}+v_{6mph}*t

Calculations for Kelly:

We have the following information,

v_{Kelly}=8mph

We need to calculate when Kelly will be 3/4 miles apart of Ava, so, it's position will be the Ava's position plus 3/4 miles.

Then, writing the equation,

x_{Ava}+0.75miles=x_{o}+v_{Kelly}*t

x_{Ava}+0.75miles=x_{o}+v_{8mph}*t

Now, substituting Ava's speed into the second equation, we have:

x_{o}+6mph*t+0.75miles=x_{o}+8mph*t

6mph*t+0.75miles=+8mph*t

8mph*t-6mph*t=0.75miles

2mph*t=0.75miles

t=\frac{0.75miles}{2mph}=0.375hours

Hence, we have that it will took 0.375 hours for Ava and Kelly to be 3/4 miles apart.

Have a nice day!

7 0
3 years ago
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16/21 × 20/24 × 28/15​
Troyanec [42]

Answer:

32/27

Step-by-step explanation:

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