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grin007 [14]
3 years ago
14

How many classes have between 27 and 31 students?

Mathematics
1 answer:
bekas [8.4K]3 years ago
5 0
I’m not sure but I think 4 classes have between 27 and 31 students
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I need help finding both volume and surface area
Svetradugi [14.3K]

Answer:

<u>Volume</u>

For the rectangle, h = 3cm, l = 8cm, w = 6cm
V = length x width x height
V = 8cm x 6cm x 3cm
V = 144cm^3

For the semi circle, we need to find the radius. The radius is width/2, so 6cm/2 = 3cm. r = 3cm, \pi = 3.14
V = radius^2 x height x \pi
V = 3cm^2 x 3cm x 3.14
V = 84.8 cm^3/2 (because the cylinder needs to be divided to form a semi-circle)
V= 42.4cm^3 (there are two cylinders though so we will multiply this by 2 in the total volume)

Total volume:
V = 144cm^3 + 42.4cm^3(2)
V = 186.4cm^3

<u>Surface Area</u>

Rectangular prism:
A = 2[w(l) + h(l) + h(w)]
A = 2[6cm(8cm) + 3cm(8cm) + 3cm(6cm)]
A = 180cm^2
But there are two sides that are covered by the semi-circular prisms, so we will have to calculate those sides and remove them.
A = l x w
A = 6cm x 3cm
A = 18cm^2(2) (2 being the two faces)
A = 36cm^2

A = 180cm^2 - 36cm^2
A = 144cm^2 (the area of the rectangle)

Semi-circular prism:
A = 2\pirh + 2\pir^2
Earlier, we found out that the radius of the circle is 3cm, so we will plug that in.
A = 2(3.14)(3cm)(3cm) + 2(3.14)(3cm)^2
A = 113.09cm^2

Total surface area:
A = 144cm^2 + 133.09cm^2
A = 277.09cm^2

Therefore the total volume of the prism is 186.4cm^3 and the total surface area is 277.09cm^2.





6 0
1 year ago
I need help I need help
Cerrena [4.2K]

Answer:

{ \boxed{ \bf{c}}} \:   \: \frac{3.8}{4}  = s

Step-by-step explanation:

{ \tt{4 \: pies \:  =   \: 3.8 \: ounces}} \\ { \tt{1 \: pie \:  =  \: ( \frac{1}{4}  \times 3.8) \: ounces}} \\ { \tt{ = 0.95 \: ounces}}

{ \underline{ \sf{ \blue{christ \: † \: alone}}}}

5 0
2 years ago
PLEASE ANSWER FAST!!!
NemiM [27]

Answer:

A- 3,000 = 50(60) + b

B- 2,100 = 50(42) + b

Step-by-step explanation:

i just did it

4 0
3 years ago
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What is the value of x is?
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Answer:

96

Step-by-step explanation:

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3 years ago
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3  of anything positive is greater than  2  of the same thing. 
I can't think of an exception.

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