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storchak [24]
3 years ago
8

Express 30.5 as a fraction in simplest form

Mathematics
1 answer:
Dima020 [189]3 years ago
8 0
Does 61/2 make sense?
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I need help on questions 48 49 and 50 and u need to find the surface area of the 3 polyhedras please and thank you!
White raven [17]

48. The surface area of a cylinder is given by

... A = 2πr² + 2πrh = 2πr(r+h)

For r = 13 mi and h = 7 mi, this becomes

... A = 2π(13 mi)(13 mi + 7 mi) = 520π mi²

The surface area of the cylinder is 520π mi² ≈ 1634 mi².

49. The surface area of a rectangular prism is

... A = 2(LW + H(L+W))

For L = 20 m, W = 10 m, H = 7 m, this becomes

... A = 2((20 m)(10 m) + (7 m)(20 m + 10 m)) = 2(200 m² + 210 m²) = 820 m²

The surface area of the prism is 820 m².

50. The formula is the same as for problem 48.

For r = 10 m and h = 13 m, this becomes

... A = 2π(10 m)(10 m + 13 m) = 460π m² ≈ 1445 m²

The surface area of the cylinder is 460π m² ≈ 1445 m².

_____

When calculations are repetitive, it is convenient to let a calculator or spreadsheet do them.

7 0
3 years ago
Find the volume of the right cone below in terms of π.<br> hight 9<br> diamiter 6
Eduardwww [97]

About 84.82

Step-by-step explanation:

The formula to find the volume of a cone is pi*r^2*(h/3). The formula to find radius is diameter/2. 6/2=3. Since r=3 and h=9, pi*3^2*(9/3)=84.82

4 0
2 years ago
Plz help me I have no idea how to do this plz help!
Vika [28.1K]
You need to multiply the amount by the tax
8 0
3 years ago
Of the 180 students in Mrs. Stanfield's class,
Nesterboy [21]

Answer:

should be 27

Step-by-step explanation:

60% of 180 is 108

25% of 108 is 27

5 0
2 years ago
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If you spin the spinner 400 times, how many times can you expect it to land on an even number?
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2/8 Hdhdjdjsksjsjsjsjsjsjsnsjsjjsksjsjsjs
3 0
3 years ago
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