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
lyudmila [28]
4 years ago
8

Two airplanes are flying in the air at the same height: airplane A is flying east at 250 mi/h and airplane B is flying north at

300 mi/h. If they are both heading to the same airport, located 30 miles east of airplane A and 40 miles north of airplane B, at what rate is the distance between the airplanes changing?
Mathematics
1 answer:
just olya [345]4 years ago
3 0

Answer:

  decreasing at 390 miles per hour

Step-by-step explanation:

Airplane A's distance in miles to the airport can be written as ...

  a = 30 -250t . . . . . where t is in hours

Likewise, airplane B's distance to the airport can be written as ...

  b = 40 -300t

The distance (d) between the airplanes can be found using the Pythagorean theorem:

  d^2 = a^2 + b^2

Differentiating with respect to time, we have ...

  2d·d' = 2a·a' +2b·b'

  d' = (a·a' +b·b')/d

__

To find a numerical value of this, we need to find the values of its variables at t=0.

  a = 30 -250·0 = 30

  a' = -250

  b = 40 -300·0 = 40

  b' = -300

  d = √(a²+b²) = √(900+1600) = 50

Then ...

  d' = (30(-250) +40(-300))/50 = -19500/50 = -390

The distance between the airplanes is decreasing at 390 miles per hour.

You might be interested in
Greatest common factor 24 & 48
Tcecarenko [31]
Greatest common factor = 24
5 0
3 years ago
Read 2 more answers
F(x)=x what is the equation of the new function shift 8 units left shift 3 units down
nasty-shy [4]
Think of the equation of a linear function:  
Recall y = mx + b   for vertical shifts, we just add or subtract from 'b' and that will move the line up or down accordingly.. However, for horizontal shifts, we will need to add or subtract from 'x'.  Note that the slope or 'm' stays the same for each type of shift.  

Now that we know how the shifts occur, we might consider a different form of the equation for a linear function:  y = a(x - h) + k  here the 'a' is just our slope, 'k' is our original y intercept, and 'h' will represent the amount of horizontal shift.  

So to get the desired transformations of a horizontal shift to the left of 8 and a vertical shift of down 3 from our original function y = x, we can make the following changes:   y = (x + 8) - 3  Now you might be confused with how we got the 'x + 8'..   Let's consider values of 'h'.  For positive values of h, the result will be a shift to the right and for negative values of h the result will be a shift to the left.  So since we want a shift to the left we need to use a '-8' and when we substitute that into our new form, y = (x - h) + k you can see the sign change.  

Now we can simplify of course and get the final equation: y = x + 5 or in function form f(x) = x + 5
4 0
3 years ago
- Olivia skates twice as far as Stephanie. This sum of their distances is 96 miles per month. How many
kotegsom [21]

Answer:

B.64 miles

Step-by-step explanation:

Let Oliver's be x

Let Stephanie's be y

x = 2y -  -  - (a) \\ x + y = 96 -  -  - (b)

substitute for x in (b):

2y + y = 96 \\ 3y = 96 \\ y = 32

find x in (a):

x = (2 \times 32) \\ x = 64

5 0
3 years ago
Read 2 more answers
Is six pen cost $2.10 what is the unit price of the pen?
Studentka2010 [4]

Answer:

3.20

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Algebra Review: Pra<br> (4x-7)(2x+1)
ki77a [65]
2x - 6 = 2 • (x - 3)
2 = 0
x-3 = 0
x=3
7 0
3 years ago
Other questions:
  • Help please!
    15·1 answer
  • Find the 12th term of the sequence which has a first term of 14 and has a common ratio of 1.03
    14·2 answers
  • Which solid figure has 5 faces,8 edges,and 5 vertices
    15·1 answer
  • Expanded version of 8x 43
    10·1 answer
  • Which is the graph of y= cos(x-pi)
    10·1 answer
  • Solve for n. 583 = (n ÷ 10) + 3
    15·1 answer
  • A surveyor stands 75 feet from a building. He measures the angle of elevation to the top of the building at 67.5°. How tall is t
    13·2 answers
  • Find the distance between the points 6 + 5i and 1 – 2i.
    13·2 answers
  • What is the theoretical probability of a bulb to be switched on?
    10·1 answer
  • 2x=22−2 Find value of x​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!