1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
marin [14]
3 years ago
12

an island has three towns located at points with the coordinates a (15,3) b (25,10) and c (0,20) where the coordinates have unit

s of Km the government wants to locate a toxic waste dump at a position as far as possible away from each town you may assume that this location is not on the edge of the island find the coordinates at the point where the toxic waste dump should be located
Mathematics
1 answer:
julsineya [31]3 years ago
4 0

9514 1404 393

Answer:

  (13.06, 16.41)

Step-by-step explanation:

Any point not on a perpendicular bisector of the line between towns will be closer to one town than the other. So, the intersection of perpendicular bisectors will be the equidistant from all towns. That point is the circumcenter of the circle circumscribing the triangle with the towns as its vertices. This can be found as the intersection of two perpendicular bisectors of the segments between the towns.

The midpoint of AB is ...

  (A +B)/2 = ((15, 3) +(25, 10))/2 = (40, 13)/2 = (20, 6.5)

The midpoint of AC is ...

  (A +C)/2 = ((15, 3) +(0, 20))/2 = (15, 23)/2 = (7.5, 11.5)

__

The differences between points are ...

  B -A = (25, 10) -(15, 3) = (10, 7)

  C -A = (0, 20) -(15, 3) = (-15, 17)

Then the perpendicular bisector equations can be written as ...

  bisector of AB  ⇒  10(x -20) +7(y -6.5) = 0

     10x +7x -245.5 = 0

  bisector of AC  ⇒  -15(x -7.5) +17(y -11.5) = 0

     -15x +17y -83 = 0

These have coefficients that aren't particularly nice, so a method similar to Cramer's Rule is suitable for solving this pair of equations. Using the "cross multiplication method", we have ...

  x = (7(-83) -17(-245.5))/(10(17) -(-15)(7)) = 3592.5/275 = 13 7/110 ≈ 13.06

  y = (-245.5(-15) -(-83)(10))/275 = 4512.5/275 = 16 9/22 ≈ 16.41

The point as far as possible from each town within the boundary of the island has coordinates (13.06, 16.41).

_____

<em>Further detail regarding the solution</em>

Here, we have written the equation for the perpendicular bisector this way. The difference in coordinates between points R and S can be called ...

  R -S = (∆x, ∆y)

The midpoint of segment RS can be called ...

  (R +S)/2 = (h, k)

Then the line that is a perpendicular bisector of RS can be written as ...

  ∆x(x -h) +∆y(y -k) = 0

This is the form that is used above.

__

The "cross multiplication method" for solving a pair of general-form linear equations ...

  ax +by +c = 0

  dx +ey +g = 0

will give the solution as ...

  1/(ae -db) = x/(bg -ec) = y/(cd -ga)

If you write the coefficients in two rows of four, the pattern of products and differences is easy to see.

  \left[\begin{array}{cccc}a&b&c&a\\d&e&g&d\end{array}\right]

You might be interested in
a jet flying at an altitude of 30000 ft passes over a small plane flying at 15000 feet headed in the same direction the jets fly
Sholpan [36]

The jet has gained on the small plane at the rate of 10 miles per minute, so is flying 600 miles per hour faster. (There are 60 minutes in an hour.)

Since the jet is flying twice as fast as the smaller plane, the small plane's speed is the same as the difference in speed: 600 mph.

The jet's speed is double that, 1200 mph.

  • small plane: 600 mph
  • jet: 1200 mph
8 0
2 years ago
Can yall help me please?
eduard

Answer:

5/6 - 2/5 = 13/30

Step-by-step explanation:

6 0
2 years ago
Rose use 1 1/2 cups of flour for every 1/3 cup of cocoa to make brownies. Enter the number of cups of flour Rose uses for 1 cup
olga55 [171]
To change 1/3 c into 1 c, you would multiply by 3. So multiply 1 1/2 c by 3 to get the answer.

7 0
3 years ago
Identify the expression equivalent to 2x + 8 by substituting x = 7 and x = 5.
Nat2105 [25]

Answer:

the answer is C ;P

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
A motorcycle can travel 48 miles for every gallon of gas used
trasher [3.6K]

Answer:

48 miles multiplied by x amount of gallons

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Other questions:
  • You calculate the number of spots on a pair of two dice that you roll, sides facing up (the total can be called "x"). this is al
    15·1 answer
  • May anyone help me on this <br> Write your answer using simplest form in all problem
    13·2 answers
  • G(x)=4+3(x-1), evaluate for g(6)
    15·1 answer
  • Which fraction is equivalent to negative 4 over 6?
    15·2 answers
  • PLS HELP ME I ONLY HAV 2 MINS PLSSSSS
    10·2 answers
  • Which expression could be used to find the value of x in the diagram WILL MARK BRAINLIEST
    15·1 answer
  • Subtract six from a number cubed
    6·1 answer
  • 3) The weight of father is four times than the weight of his son.If the weight of
    9·1 answer
  • What type of number is 4+5√2?
    13·1 answer
  • you are given a fraction in simplest form. the numerator is not zero.when you write the fraction as a decimal,it is a repeating
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!