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
grandymaker [24]
3 years ago
10

BRAINLIEST AND 20 POINTS FOR CORRECT ANSWER WITH EXPLAINATION!

Mathematics
1 answer:
jeyben [28]3 years ago
8 0

The formula for t=s/(v₁+v₂), and the value of t is 2 hours.

Step-by-step explanation:

The question is on relative speed.

For the two trains moving towards each other , the relative speed is the sum of their speeds.

Distance between the cities= s miles

Train 1 : speed is v₁ mph

Train 2: speed is v₂ mph

Time of meeting= t

Applying formula for speed, speed =distance/time

Time of meeting= Distance/relative speed

t=s/(v₁+v₂)

Given s=310, v₁=75 and v₂=80, then finding t

t=310/(75+80)

t=310/155 = 2 hrs

Learn More

Relative Speed : brainly.com/question/13080364

Keyword : speed

#LearnwithBrainly

You might be interested in
What is 5x + 3x equal to
Gekata [30.6K]
The answer is 8x.
You are combining like terms as 5 and 3 both have x so you are simply adding 5+3= 8
3 0
3 years ago
Read 2 more answers
The links of the sides of a triangle are given determine if the triangle is a right triangle if it is identify the hypotenuse
Advocard [28]

Answer:

I would choose A

Step-by-step explanation:

I chose A because it's an hypotenuse because of the different sides

7 0
2 years ago
What set of transformations could be applied to rectangle ABCD to create A″B″C″D″? 'Rectangle formed by ordered pairs A at negat
CaHeK987 [17]

Answer:

Reflection over the y-axis and rotation of 180°

Step-by-step explanation:

We have,

Rectangle ABCD with co-ordinates A(-4,2), B(-4,1), C(-1,1) and D(-1,2).

It is transformed to a new rectangle A'B'C'D' with co-ordinates A'(-4,-2), B'(-4,-1), C'(-1,-1) and D'(-1,-2).

The graph of both the triangles is shown below.

we see that,

The rectangle ABCD is reflected about y-axis and then rotated 180° to obtain A'B'C'D'.

                     Reflected about y-axis                     Rotation of 180°

A= (-4,2)                     (4,2)                                              A'= (-4,-2)

B= (-4,1)                      (4,1)                                                B'= (-4,-1)

C= (-1,1)                       (1,1)                                                 C'= (-1,-1)

D= (-1,2)                      (1,2)                                                 D'= (-1,-2)

Hence, the second rectangle is formed by: Reflection over the y-axis and rotation of 180°.

5 0
2 years ago
Read 2 more answers
At a local university, a sample of 49 evening students was selected in order to determine whether the average age of the evening
pav-90 [236]

Answer:

z=\frac{23-21}{\frac{3.5}{\sqrt{49}}}=4    

p_v =2*P(z>4)=0.0000633  

When we compare the significance level \alpha=0.1 we see that p_v so we can reject the null hypothesis at 10% of significance. So the  the true mean is difference from 21 at this significance level.

Step-by-step explanation:

Data given and notation  

\bar X=23 represent the sample mean

\sigma=3.5 represent the population standard deviation

n=49 sample size  

\mu_o =21 represent the value that we want to test

\alpha=0.1 represent the significance level for the hypothesis test.  

z would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the average age of the evening students is significantly different from 21, the system of hypothesis would be:  

Null hypothesis:\mu = 21  

Alternative hypothesis:\mu \neq 21  

The statistic is given by:

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}  (1)  

Calculate the statistic

We can replace in formula (1) the info given like this:  

z=\frac{23-21}{\frac{3.5}{\sqrt{49}}}=4    

P-value

Since is a two sided test the p value would be:  

p_v =2*P(z>4)=0.0000633  

Conclusion  

When we compare the significance level \alpha=0.1 we see that p_v so we can reject the null hypothesis at 10% of significance. So the  the true mean is difference from 21 at this significance level.

8 0
3 years ago
8. If a runner’s power is 400 W as she runs, how much chemical energy does she convert into other forms in 10.0 minutes? E = P X
spin [16.1K]

Answer:

2400kJ

Step-by-step explanation:

Step one:

given data

power P= 400W

time = 10minutes

to seconds= 60*10 = 600 seconds

Required

the energy

Step two:

we know that Energy= power * time

E=P*t

E=400*600

E=240000

E=2400kJ

She converts 2400kJ into other forms

5 0
2 years ago
Other questions:
  • What is the spees of the boat in meters per
    8·1 answer
  • Helena lost her marbles. But then she found them and put them in 44 bags with mm marbles in each bag. She had 33 marbles left ov
    13·1 answer
  • angle, a and angle, b are complementary angles. angle a measures 22, degrees. What is the measure of angle b?
    14·1 answer
  • What is 127/100 as a percent
    15·2 answers
  • Which of the following choices is equivalent to the expression below?
    11·1 answer
  • If (x)=3x-1 and s(x)=2x+1, which expression is equivalent to r over s (6) ?
    5·1 answer
  • How many pairs of parallel lines have in a trapezoid
    9·2 answers
  • Which description best describes the solution to the following system of equations? (4 points)
    10·1 answer
  • Alguien puede resolver esto por favor <br>​
    14·1 answer
  • Find the values of a and b so that the linear system has the given solution.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!