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
VARVARA [1.3K]
3 years ago
15

Two mechanics worked on a car. The first mechanic charged S95 per hour, and the second mechanic charged $115 per hour.

Mathematics
1 answer:
natima [27]3 years ago
5 0

Answer:

First mechanic worked for 10 hours and second mechanic worked for 15 hours.

Step-by-step explanation:

Let first mechanic worked for X hours and second mechanic worked for Y hours .

Now, according to the question , they worked for a total of 25 hours .

Thus ,

X + Y = 25.

Y = 25 - X   -(1)

Also, first mechanic is charging $ 95 per hour and second mechanic is charging $115 per hour .

Thus, total money charged by them will be 95X + 115Y .

Which is given to be $2675 in the question.

Thus 95X + 115Y = 2675.   -(2)

Putting equation 1 in equation 2 we get ,

95X + 2875 - 115X = 2675

20X = 200

X = 10 hours.

Thus , Y =  25 - X = 15 hours.

Thus first mechanic worked for 10 hours and second mechanic worked for 15 hours.

You might be interested in
Help me rickroll you
skelet666 [1.2K]

Answer:

Shoyo here!

Step-by-step explanation:

wow.

5 0
3 years ago
Read 2 more answers
A researcher claims that the variation in the salaries of elementary school teachers is greater than the variation in the salari
guajiro [1.7K]

Answer:

a

The null hypothesis is  H_o :  \sigma^2_1 = \sigma^2 _2

The alternative hypothesis is H_a :  \sigma_1 ^2 > \sigma^2_2

b

F_{critical} = 1.8608

c

F = 2.9085

d

    The decision rule is  

Reject the null hypothesis

e

There is sufficient evidence to support the researchers claim

Step-by-step explanation:

From the question we are told that

 The first sample size is  n_1 = 30

 The sample variance for elementary school is  s^2_1 = 8324

 The second sample size is  n_2 = 30

  The sample variance for the secondary school is  s^2_2 = 2862

   The significance level is  \alpha = 0.05

The null hypothesis is  H_o :  \sigma^2_1 = \sigma^2 _2

The alternative hypothesis is H_a :  \sigma_1 ^2 > \sigma^2_2

Generally from the F statistics table  the critical value of \alpha = 0.05 at first and  second degree of freedom df_1 = n_1 - 1 = 30 - 1 = 29 and  df_2 = n_2 - 1 = 30 - 1 = 29 is  

         F_{critical} = 1.8608

Generally the test statistics is mathematically represented as

       F = \frac{s_1^2 }{s_2^2}

=>   F = \frac{8324 }{2862}

=>   F = 2.9085

Generally from the value obtained we see that  F >  F_{critical } Hence

   The decision rule is  

Reject the null hypothesis

    The conclusion is  

  There is sufficient evidence to support the researchers claim

   

4 0
3 years ago
I NEED HELP ASAP 40points
kaheart [24]

Answer:

5, 9 go in the boxes (left to right)

2 goes in second box on the bottom

Step-by-step explanation:

i dont what goes in the first bottom box

6 0
3 years ago
If Jared makes 25 out of 30 shots on goal, what is the percentage?​
aniked [119]

Answer:

\frac{25}{30}  \times 100\% = 0.833 \times 100\% \\ =  83.3\%

7 0
3 years ago
PLEASE HURRY!!
barxatty [35]

Answer: Is a function

the question unfinished so it will be hard to solve

3 0
3 years ago
Read 2 more answers
Other questions:
  • The residual plot for a data set is shown. Based on the residual plot, which statement best explains whether the regression line
    6·1 answer
  • I WILL GIVE BRAINLIEST to who answers this question correctly.
    13·1 answer
  • Why does the equation 35-5x+6x-36=-24-17x+17x+24 have one solution
    9·2 answers
  • Estimate. Then record the product $149 x 5
    11·1 answer
  • 4x+7y=-22 i really need help what are the letters
    7·2 answers
  • Consider the diagram below.<br> Which of the following statements is correct?
    5·2 answers
  • In 20 years Mark will be three times as old as he was 10 years ago how old is he
    11·1 answer
  • 2 5/8 times 1 1/7 equals
    8·2 answers
  • What is equivalent to 45/75?
    11·2 answers
  • Find the sales tax :<br>$32 meal with a 6% tax<br>Tax = $__​
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!