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Alex787 [66]
3 years ago
7

Which expression represents"divide the sum of x and 2 by 4"?

Mathematics
1 answer:
labwork [276]3 years ago
3 0

Answer:

Step-by-step explanation:

pix

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A rubber ball is dropped from the top of a hole. Exactly 20 seconds later, the sound of the rubber ball hitting bottom is heard.
gayaneshka [121]

9514 1404 393

Answer:

  4192.9 ft

Step-by-step explanation:

We assume your falling-distance formula is supposed to be ...

  s = 16t²

So, the time required to fall distance s is ...

  t = √(s/16) = (1/4)√s

The time required for sound to travel distance s is ...

  s = 1100t

  t = s/1100

Then the sum of the time for the ball to fall and the time for the sound to travel back is ...

  (1/4)√s + s/1100 = 20

  275√s = 22000 -s . . . . . multiply by 1100 and subtract s

  75625s = s^2 -44000s +484,000,000 . . . square both sides

  s^2 -119,625s +484,000,000 = 0 . . . . put in standard form

  s ≈ (1/2)(119,625 ±√12,374,140,625) = {4192.943, 115432.057}

Only the smaller of these two solutions makes any sense in this problem.

The hole is about 4192.9 feet deep.

_____

<em>Additional comment</em>

The distance equation for the falling object presumes a vacuum. The sound transmission presumes the presence of air, so the question setup is self-contradictory.

7 0
3 years ago
Is 4 to 7 the same as 7 to 4? Explain why or why not.
Galina-37 [17]

Answer: no

Step-by-step explanation:

4 is smaller than 7. And 7 is greater than 4 so let's just say ur solving a division problem multiplication ect you always need to put the greater number first!

So yeah hope I helped! <3

3 0
3 years ago
Read 2 more answers
PLS HELP ASAP DUE IN 40 MINUTES
Dmitriy789 [7]

Answer:

It is  (A)  4 congruent faces

Step-by-step explanation:

Easy to see how its the Base sides

-Hope it helped

3 0
3 years ago
Read 2 more answers
I have 15a but I need 15b and 14
Naily [24]
14. For a prism, the volume is given by
.. V = Bh . . . . . . . . where B is the area of the base, and h is the height of the prism

For a pyramid, the volume is given by
.. V = (1/3)*Bh . . . . where B is the area of the base, and h is the height of the pyramid

The volume is proportional to the area of the base. If the dimensions of the base decrease linearly to zero at the height of the geometry as they do for pyramids and cones, then the volume formula includes a factor of 1/3.


15b. The volume of a pyramid is 1/3 that of a prism with the same base area and height.
8 0
3 years ago
An airplane flying at an altitude of 32,000 feet descends at a rate of 1,300 feet per minute
Rashid [163]
Not sure if there is a question here. However, I'll assume you're looking for when it lands. It takes about 24.6 minutes to land. 
7 0
3 years ago
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