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Vikki [24]
3 years ago
10

The slope of a horizontal line is

Mathematics
2 answers:
Ne4ueva [31]3 years ago
6 0
The slope of the line is zero.

11111nata11111 [884]3 years ago
5 0
The slope of a horizontal line is zero
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A boat travels at 15 km/hr in still water. In travelling 45 km downstream from town A to town Bit completes the journey in 75 mi
Crank
Let the speed of river be x   km/hr down stream.

Time = Distance / speed

Since river flows downstream,  speed of boat down stream = Speed of boat + speed of river =  (15 + x).

 Since river flows downstream,  speed of boat upstream = Speed of boat - speed of river =  (15 - x).

Time Upstream - Time Downstream = 75 minutes

Time Upstream =  45 / (15 - x)

Time Downstream =  45 / (15 + x)

75 minutes = 75/60  =  5/4 hours

Time Upstream - Time Downstream = 75 minutes = 5/4 hours

45 / (15 - x)    -    45 / (15 + x)  = 5/4          Divide both sides by 45

1 / (15 - x)    -    1 / (15 + x)  = (5/4)*(1/45)

 1 / (15 - x)    -    1 / (15 + x)  = 1/36

((15 + x) - (15 -x)) / (15-x)(15+x)  = 1/36

(15 +x - 15 +x) / (15-x)(15+x)  =  1/36

  2x / (15-x)(15+x)  = 1/36

 (15-x)(15+x) = 2x*36

(15-x)(15+x) = 72x

225 - x² = 72x

0 =  x² + 72x -225

x² + 72x -225 = 0            This is a quadratic function, use a calculator that can solve the function, by inputting the function.

x = 3, or -75.  Since we are solving for speed, we can not have negative values.

x = 3 is the only valid solution.

Speed of the river =  3 km/hr  downstream.

Copyright.
7 0
3 years ago
Jace gathered the data in the table. He found the approximate line of best fit to be y = –0.7x + 2.36.
MaRussiya [10]
The residual value is -1.14.
Plug 5 into x
y=-0.7(5)+2.36
=-1.14
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3 years ago
6-3y + (-9y) +4.7<br> Please help
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The answer is 10.7−12y
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2 years ago
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Graph the system of equations on your graph paper to answer the question.
Alik [6]

Answer:

y=-x-0.833.....

Step-by-step explanation:

You solve for Y in the first two and then solve for x in the last two parts of the problem.

7 0
3 years ago
If the supplement of an angle is 30 degrees more than the measure of the angle, what is the measure of the angle???? First corre
kogti [31]
The supplement of 30° is the angle that when added to 30° forms a straight angle (180° ).
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