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
Aleksandr [31]
3 years ago
10

Jwdfkjasnfjasdhfokjasfnhj asjdnajskd

Mathematics
1 answer:
san4es73 [151]3 years ago
4 0
Lol I’m confused???????
You might be interested in
PLEASE HELP A flight across the US takes longer east to west then it does west to east. This is due to the plane having a headwi
il63 [147K]
To solve our questions, we are going to use the kinematic equation for distance: d=vt
where
d is distance 
v is speed  
t is time 

1. Let v_{w} be the speed of the wind, t_{w} be time of the westward trip, and t_{e} the time of the eastward trip. We know from our problem that the distance between the cities is 2,400 miles, so d=2400. We also know that the speed of the plane is 450 mi/hr, so v=450. Now we can use our equation the relate the unknown quantities with the quantities that we know:

<span>Going westward:
The plane is flying against the wind, so we need to subtract the speed of the wind form the speed of the plane:
</span>d=vt
2400=(450-v_{w})t_{w}

Going eastward:
The plane is flying with the wind, so we need to add the speed of the wind to the speed of the plane:
d=vt
2400=(450+v_{w})t_{e}

We can conclude that you should complete the chart as follows:
Going westward -Distance: 2400 Rate:450-v_w Time:t_w
Going eastward -Distance: 2400 Rate:450+v_w Time:t_e

2. Notice that we already have to equations:
Going westward: 2400=(450-v_{w})t_{w} equation(1)
Going eastward: 2400=(450+v_{w})t_{e} equation (2)

Let t_{t} be the time of the round trip. We know from our problem that the round trip takes 11 hours, so t_{t}=11, but we also know that the time round trip is the time of the westward trip plus the time of the eastward trip, so t_{t}=t_w+t_e. Using this equation we can express t_w in terms of t_e:
t_{t}=t_w+t_e
11=t_w+t_e equation
t_w=11-t_e equation (3)
Now, we can replace equation (3) in equation (1) to create a system of equations with two unknowns: 
2400=(450-v_{w})t_{w}
2400=(450-v_{w})(11-t_e) 

We can conclude that the system of equations that represent the situation if the round trip takes 11 hours is:
2400=(450-v_{w})(11-t_e) equation (1)
2400=(450+v_{w})t_{e} equation (2)

3. Lets solve our system of equations to find the speed of the wind: 
2400=(450-v_{w})(11-t_e) equation (1)
2400=(450+v_{w})t_{e} equation (2)

Step 1. Solve for t_{e} in equation (2)
2400=(450+v_{w})t_{e}
t_{e}= \frac{2400}{450+v_{w}} equation (3)

Step 2. Replace equation (3) in equation (1) and solve for v_w:
2400=(450-v_{w})(11-t_e)
2400=(450-v_{w})(11-\frac{2400}{450+v_{w}} )
2400=(450-v_{w})( \frac{4950+11v_w-2400}{450+v_{w}} )
2400=(450-v_{w})( \frac{255011v_w}{450+v_{w}} )
2400= \frac{1147500+4950v_w-2550v_w-11(v_w)^2}{450+v_{w}}
2400(450+v_{w})=1147500+2400v_w-11(v_w)^2
1080000+2400v_w=1147500+2400v_w-11(v_w)^2
(11v_w)^2-67500=0
11(v_w)^2=67500
(v_w)^2= \frac{67500}{11}
v_w= \sqrt{\frac{67500}{11}}
v_w=78

We can conclude that the speed of the wind is 78 mi/hr.
6 0
3 years ago
I need an explantion on this question
svlad2 [7]
Y= -x + 2 and y= 3x - 4
As these both equal y, you know that they both equal each other so
-x + 2 = 3x - 4
Third option :)
5 0
2 years ago
Read 2 more answers
What is the y-intercept of y=(-3)-7x
salantis [7]
<span>y-intercept when x  = 0
so if x = 0, y = -3

answer
</span><span>y-intercept (0, -3)</span>
6 0
3 years ago
What is the surface area?<br>square Varas​
UNO [17]

Answer:

1083 square feet

Explanation:

6 0
3 years ago
The electric bill in May was $248.00. In June the bill was $265.00. What is the percent of increase rounded to the nearest hundr
natali 33 [55]
1) May: 248$ and june 265$. The difference is 17$ and then you divide the difference with the old price: 17/ 248 = 6,85% 
2) Same method, the difference is 59$ so 27,44%' 
3) The difference is 9,5$ so you answer is 63,3% 
<span>4) The difference is 10$ divided by the original price: 10/24 = 41,66%</span>
4 0
3 years ago
Read 2 more answers
Other questions:
  • What is the domain and range of f(x)=4 x 2 to the x power
    11·1 answer
  • What is the recursive formula for this arithmetic sequence?<br> -4,3,10,17,...
    14·2 answers
  • In a basketball game,Carolyn made 14 out of 20 shots. Anna made 16 out of 24 shots. Explain how you can tell if the two players
    5·1 answer
  • Solve the equation 1/2x=7/6
    9·2 answers
  • -1.5,-1,?,0 what is the missing ? HELP PLZ
    15·2 answers
  • The radius of a cylindrical water tank is 5.5ft, and its height is 13ft. What is the volume of the tank?
    12·1 answer
  • 7 is 70% of what number
    13·2 answers
  • HELPPPP NOWW PLEASE I HAVE 10 MINS AND HAVE GOTTEN ALL WRONG SO FAR PLS
    13·1 answer
  • A dolphin jumps from the water at initial velocity of 16 feet per second. The equation h= -16t^2+80t models the dolphin's height
    9·1 answer
  • Jacob opens a savings account for a vacation with $200.50. Jacob wants to have at least $856.90 in the account in 4 weeks. What
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!