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Oksanka [162]
3 years ago
11

What is the volume of this pyramid?

Mathematics
1 answer:
lara [203]3 years ago
3 0
The answer is C grrrr
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P URGENT I've got a timer going on but really need your help to answer this thank you!!
astraxan [27]

Given:

The radius of inner circle = 13 yd.

The width of the shaded region = 8 yd

To find the area of the shaded region.

Now,

The radius of the outer circle = 13+8 yd = 21 yd

Formula

The area of a circle of radius r unit is \pi r^{2} sq unit.

A = A_{1}-A_{2}

where, A = The area of the shaded region

A_{1} = Area of the outer region

A_{2}= Area of the inner region

Now,

A_{1}= \pi (21^{2})

A_{1} = (3.14)(21)(21)

A_{1}= 1384.74 sq yd

And,

A_{2} = \pi (13^{2})

A_{2} = (3.14)(13)(13)

A_{2}= 530.66 sq yd

Therefore,

A = 1384.74-530.66 sq yd

A = 854.08 sq yd

Hence,

The area of the shaded region 854.08 sq yd.

7 0
3 years ago
A biologist took a count of the number of migrating waterfowl at a particular lake, and recounted the lake's population of water
taurus [48]

Quadratic function ( in standard form ):

y = a x² + b x + c

x = 0:

635 = 0 + 0 + c

c = 635

x = 1:

644 = a + b + 635

a + b = 9

x = 2:

719 = 4 a + 2 b + 635

4 a + 2 b = 84

and now we have a system:

a + b = 9   /  * ( - 2 )

4 a + 2 b = 84

-------------------------

- 2 a + 2 b = - 18

+

 4 a + 2 b  = 84

-------------------------

  2 a = 66

 a = 33;   b = - 24;

 Function is:

 f ( x ) = 33 x² - 24 x + 635

f ( 8 ) = 33 * 64 - 24 * 8 + 635 = 2,112 - 192 + 635 = 2,555

 Answer: The number of waterfowl on week 8 would be 2,555.

 

8 0
3 years ago
Mari is adding (-7) and (-2). She adds their absolute values and says the answer is 9.
Helen [10]

Answer:

ari is adding (-7) and (-2). She adds their absolute values and says the answer is 9.

What did Mari forget?

A

that is neither positive nor negative

B

to move left on the number line

С

to keep the sign of the larger integer

D

to keep the sign of the two integers being adde

Step-by-step explanation:

5 0
2 years ago
You travel 50 miles in 4 hours. What is your average speed of
Kisachek [45]

Answer:

12.5 mph

Step-by-step explanation:

50 miles / 4 hours=

25 miles / 2 hours=

12.5 mph

7 0
2 years ago
Select the correct answer.
Crazy boy [7]

Answer:

16

Step-by-step explanation:

to get from 3/4 to 12/x you gotta multiple 3 times 4 which is 12 so the bottom multiple that by 4 also which 4 x 4 is 16

3 0
3 years ago
Read 2 more answers
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