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Maksim231197 [3]
2 years ago
8

Does anybody have the backward 3 with a dot on the top and bottom symbol for and? If so can somebody please put it in the answer

so I can copy and paste it into my document! If you use a Chromebook and if there is a UNICODE for it you can tell me what it is and how to use it if you want! Please and thanks! here is what it looks like:
.
backward 3
.
Mathematics
1 answer:
MA_775_DIABLO [31]2 years ago
6 0

Answer:

.

Step-by-step explanation:

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3 years ago
A train travels 110 km in the same time that a plane covers 385 km. If the speed of the plane is 20 km per hr less than 4 times
slamgirl [31]

Answer:

  • train: 40 kph
  • plane: 140 kph

Step-by-step explanation:

Let t represent the speed of the train in km/h. Then 4t-20 is the speed of the plane. Travel times are the same, so we can use the formula ...

  time = distance/speed

and equate the travel times.

  110/t = 385/(4t-20)

Cross multiplying gives ...

  110(4t -20) = 385t

  440t -2200 = 385t . . . . . eliminate parentheses

  55t -2200 = 0 . . . . . . . . . subtract 385t

  t -40 = 0 . . . . . . . . . divide by 55

  t = 40 . . . . . . . . . . . add 40; train's speed is 40 kph

  4t -20 = 140 . . . . . . find plane's speed; 140 kph

The train's speed is 40 km/h; the plane's speed is 140 km/h.

_____

<em>Check</em>

Train's travel time = 110 km/(40 km/h) = 2.75 h.

Plane's travel time = 385 km/(140 km/h) = 2.75 h.

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2 years ago
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Answer:

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C is wrong, because 1 standard deviation up from the mean is 0.65, and 0.7 is outside of that.

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Answer:

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Step-by-step explanation:

36 * 1/4

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3 years ago
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