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Fynjy0 [20]
3 years ago
10

What us the estimate 30-20.91

Mathematics
2 answers:
zimovet [89]3 years ago
8 0
9.09 I'm pretty sure this it 
aleksandr82 [10.1K]3 years ago
7 0
The estimate for 30-20.91 is 9.09 or 9.1

Hope I helped :)

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ASAP What is the lateral area of this regular octagonal pyramid?? Explain your answer if you can plz thanks
Archy [21]
The lateral area would be 298.7 cm².

The lateral area is the area of all of the lateral faces of the pyramid.  There are 8 triangles making up the lateral faces.  Each has a base of 6.6.  The formula for the area of a triangle is

A=1/2bh,

so we still need the height of the triangle.

The height of each lateral triangle is the slant height of the pyramid.  The slant height of the pyramid forms a right triangle with the height of the pyramid and the "radius" as it were of the pyramid.  Thus we use the Pythagorean theorem:

8²+8²=h²
64+64=h²
128=h²
√128=√(h²)
8√2 = h

Substituting this into our area formula we have:
A=1/2(6.6)(8√2)

We will go ahead and multiply this by 8, since there are 8 lateral faces:
LA=8(1/2)(6.6)(8√2)
LA = 298.7
3 0
4 years ago
Read 2 more answers
Whats the square root of 81
lara31 [8.8K]

The answer is 9 because 9x9=81. Hope this helps!

8 0
3 years ago
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Help PLEASESSS due in 20
kicyunya [14]
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  3. (4 + 4 + 4) ÷ 4
  4. √4 + √4 + 4 - 4
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  6. √4 + 4 + 4 - 4
  7. 4 + 4 - 4 ÷ 4
  8. 4 + 4 + 4 - 4
  9. 4 + 4 + 4 ÷ 4
  10. √4 + √4 + √4 + 4
  11. 44/(√4 + √4)
  12. √4 + √4 + 4 + 4
  13. 44/4 + 4
  14. 4 + 4 + 4 + √4
  15. 44/4 + 4
  16. 4 * 4 * 4 ÷ 4
  17. 4 * 4 + 4 ÷ 4
  18. 4 * 4 - √4 + 4
  19. 4! - 4 - 4 ÷ 4
  20. 4 * (4 + 4 ÷ 4)
  21. 4! - 4 + 4 ÷ 4
  22. 4 * 4 + 4 + √4
  23. 4! - √4 + 4/4
  24. 4 * (√4 + √4 + √4)
  25. 4! + √2 - 4 ÷ 4
  26. 4! + √4 + 4 - 4
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7 0
3 years ago
What number set does 0 belong to
GuDViN [60]

Whole, integer, and rational

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78.2 times 10 to the fourth power in standard form
aivan3 [116]

you would move the decimal to the right four times giving you 782000

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