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Ivanshal [37]
3 years ago
5

The driver of a car traveling at 54ft/sec suddenly applies the brakes. The position of the car is s=54t-3t^2, t seconds afyer th

e driver applies the brakes.
How many seconds after the driver applies the brakes does the car come to a stop
Mathematics
1 answer:
castortr0y [4]3 years ago
6 0
  <span>s = 60t - 3t^2 
v = ds/dt = 60 - 6t 

when it comes to rest, v = 0, 
so t = 10 sec 

now distance travelled = time taken x average velocity 
= 10 x (60 + 0)/2 
= 300 ft 

</span>
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Answer:

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Step-by-step explanation:

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3 years ago
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In triangle ABC, the length of side AB is 19 inches and the length of side BC is 28 inches. Which of the following could be the
DENIUS [597]
<h3>Answer:  C) 42 inches</h3>

=========================================================

Explanation:

Let's say we have a triangle with sides x,y,z

Also, let's further say we know that x = 19 and y = 28 (from AB and BC respectively).

The third missing side z can't be nailed down to a single number, but we can establish a possible range. That range is

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So any number between 9 and 47, excluding both endpoints, will work as a possible side length for the third missing side.

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The only thing left is choice C. The 42 is between 9 and 47

In other words, 9 < 42 < 47 is true.

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Side note: I'm using a modification of the triangle inequality theorem.

8 0
3 years ago
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TEA [102]
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Answer:

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