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MAXImum [283]
3 years ago
12

3.3+5(-7 + 4)step by step process​

Mathematics
2 answers:
SVEN [57.7K]3 years ago
5 0

Answer:

-11.7

Step-by-step explanation:

3.3+5(-7 + 4)

we apply distributive property

3.3+5*(-7) + 5*(4)

we know:

+ * - = -

+ * + = +

so we have:

3.3 -35 + 20

3.3 - 15

-11.7

Scilla [17]3 years ago
3 0
You would do parentheses first, so you would do -7+4= -3, then you would do 3.3 + 5 which would be 8.3, then you would do 8.3 x -3 and that would be -24.9
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You are arguing over a cell phone while trailing an unmarked police car by 25 m; both your car and the police car are traveling
BARSIC [14]

Answer:

  (a) 15 m

  (b) ground speed: 26.14 m/s (94.1 km/h); relative speed 12 m/s

Step-by-step explanation:

We can choose the frame of reference to be the trailing car. We can start counting time from the point the lead car begins deceleration. Then its position (in meters) relative to the trailing car is ...

  d(t) = 25 - 5/2t² . . . . . . where 25 m is the initial distance and -5 is the acceleration in m/s².

(a) Then the distance between cars at t=2 is ...

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__

(b) The <em>relative velocity</em> at 2.4 seconds is ...

  d'(t) = -5t

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The closure speed with the police car is 12 m/s.

__

We need to do a little more work to find the ground speed of the trailing car when the cars bump.

The distance between the cars at t=2.4 seconds is ...

  d(2.4) = 25 -(5/2)2.4² = 10.6 . . . . meters

At the closure speed of 12 m/s, it will take an additional ...

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to close the gap. The speed of the trailing car at that point in time will be the original speed less the deceleration for 0.8833 seconds:

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     = 26 5/36 m/s = 94.1 km/h

_____

<em>Comment on following distance</em>

To avoid collision, the trailing car must be trailing by at least the distance it covers in 2.4 seconds, about 73 1/3 meters.

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3 years ago
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Luden [163]

Answer:

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Step-by-step explanation:

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