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Anuta_ua [19.1K]
2 years ago
14

Select the graph of the solution. Click until the correct graph appears. |x| = 3

Mathematics
1 answer:
shtirl [24]2 years ago
4 0
The correct graph is the third one, with the solid dots at -3 and 3.

The bars around x stand for absolute value, which is defined as the distance a number is from 0.  We want to know what number or numbers is/are 3 units away from 0 on a number line; the only choices are 3 or -3. 

This means we must plot points at -3 and 3.  They must be solid points, since these numbers are included in the solution (they are, in fact, the only ones of the solution).
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Two cars simultaneously left Points A and B and headed towards each other, and met after 2 hours and 45 minutes. The distance be
Oksana_A [137]
<h2>Hello!</h2>

The answers are:

FirstCarSpeed=41mph\\SecondCarSpeed=55mph

<h2>Why?</h2>

To calculate the speed of the cars, we need to write two equations, one for each car, in order to create a relation between the two speeds and be able to calculate one in function of the other.

So,

Tet be the first car speed "x" and the second car speed "y", writing the equations we have:

For the first car:

x_{FirstCar}=x_o+v*t

For the second car:

We know that the speed of the second car is the speed of the first car plus 14 mph, so:

x_{SecondCar}=x_o+(v+14mph)*t

Now, from the statement that both cars met after 2 hours and 45 minutes, and the distance between to cover (between A and B) is 264 miles,  so, we can calculate the relative speed between them:

If the cars are moving towards each other the relative speed will be:

RelativeSpeed=FirstCarSpeed-(-SecondCarspeed)\\\\RelativeSpeed=x-(-x-14mph)=2x+14mph

Then, since we know that they covered a combined distance equal to 264 miles in 2 hours + 45 minutes, we have:

2hours+45minutes=120minutes+45minutes=165minutes\\\\\frac{165minutes*1hour}{60minutes}=2.75hours

Writing the equation:

264miles=(2x+14mph)*t\\\\264miles=(2x+14mph)*2.75hours\\\\2x+14mph=\frac{264miles}{2.75hours}\\\\2x=96mph-14mph\\\\x=\frac{82mph}{2}=41mph

So, the speed of the first car is equal to 41 mph.

Now, for the second car we have that:

SecondCarSpeed=FirstCarSpeed+14mph\\\\SecondCarSpeed=41mph+14mph=55mph

We have that the speed of the second car is equal to 55 mph.

Hence, the answers are:

FirstCarSpeed=41mph\\SecondCarSpeed=55mph

Have a nice day!

7 0
3 years ago
Derivative of cos(4x)
son4ous [18]
D/dx ( cos (4x)) = - sin (4x) · d/dx ( 4x) = - 4 sin (4x) 
7 0
3 years ago
I need help on those two!!!
larisa86 [58]

Answer:

8. B

9. A

Step-by-step explanation:

4 0
3 years ago
PLEASE HELPPP<br> ASAP!!!!!
kow [346]

Answer:

with what exactly

Step-by-step explanation:

8 0
3 years ago
Here it the following question
ale4655 [162]

Answer:

1/3

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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