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
ankoles [38]
3 years ago
7

Suppose a heat exchanger costs $1200 and reduces the heating bill by $200 per year what is the payback time?

Mathematics
1 answer:
natima [27]3 years ago
8 0

6 months is the answer 200×6=1200

You might be interested in
How to do this question plz ​
Artyom0805 [142]

Answer:

90(8) + 2(38) = 270 + 76 = 346p

Step-by-step explanation:

5 0
3 years ago
The first eight quizzes in this class had average scores of 8,9,9,8,8,9,8,7. This gives a sample mean of 8.25 and a sample stand
alexira [117]

Answer:

<em>Test statistic </em>

<em>               </em>t = \frac{x^{-} -mean}{\frac{S}{\sqrt{n} } }  

            t = <em>1.076</em>

Step-by-step explanation:

<u><em>Step(i):-</em></u>

Given Mean of the Population (μ) = 8.0

<em>Mean of the sample (x⁻) = 8.25</em>

Given data

                  8,9,9,8,8,9,8,7

Given sample size  n= 8

Given sample standard deviation(S) = 0.661

<u><em>Step(ii):-</em></u>

<em>Null hypothesis : H:  (μ) = 8.0</em>

<em>Alternative Hypothesis :H:(μ) > 8.0</em>

<em>Degrees of freedom = n-1 = 8-1=7</em>

<em>Test statistic </em>

<em>               </em>t = \frac{x^{-} -mean}{\frac{S}{\sqrt{n} } }<em></em>

<em>              </em>t = \frac{8.25 -8.0}{\frac{0.661}{\sqrt{8} } }<em></em>

<em>            t =  1.076</em>

<em>Critical value </em>

<em>                    t₍₇,₀.₀₅₎   = 2.3646</em>

<em>The calculated value   t =  1.076 < 2.3646 at 0.05 level of significance</em>

<em>Null hypothesis is accepted</em>

<em>Test the hypothesis that the true mean quiz score is 8.0 against the alternative that it is not greater than 8.0</em>

<em></em>

3 0
3 years ago
Which phrases can be used to represent the inequality 12-3x≥9? Check all that apply. (multi choice)
balandron [24]

Answer:

Which phrases can be used to represent the inequality 12-3x≥9? Check all that apply. (multi choice)

<u> A Twelve less than three times a number is greater than or equal to nine. </u>

B Twelve less than three times a number is at least nine.

C Twelve less three times a number is at least nine.

D Twelve minus the product of three and a number is no more than nine.

E Twelve less three times a number is at most nine.

F Twelve minus the product of three and a number is no smaller than nine.

G Twelve minus the product of three and a number is larger than nine.

Step-by-step explanation:

12 - 3x>=9

8 0
3 years ago
Please help meeeeee :///
eimsori [14]
Wouldn't all the angles equal 180? We've been trying to learn these but I think so. Subtract both numbers by 180 and it should be the answer. Sorry if it's wrong but I'm not sure. I kinda hope this helps you any
5 0
3 years ago
Read 2 more answers
PLEASE HELP!!!!!!!!!!!!
Dafna11 [192]

Answer:

10

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • True or false: equilateral triangles can be classified as acute right or obtuse
    11·1 answer
  • Please answer please
    9·1 answer
  • X+y ≥20
    13·1 answer
  • HELP PLS I NEED THIS DONE ASAP
    12·1 answer
  • Find the distance between<br> 2-3i<br> And<br> 9+21i
    12·1 answer
  • Find the remainder when f(x)=x3−4x2−6x−3 f ( x ) = x 3 − 4 x 2 − 6 x − 3 is divided by x+1
    14·1 answer
  • What is the scale of a drawing where a 36 foot tall statue is 9 inches tall?
    12·1 answer
  • I need help please!!! <br> I need the answer take your time to answer it please!
    10·2 answers
  • Sophia is designing the seating arrangement for a concert and
    5·1 answer
  • Find the product of (4c-5)(7x^2m- 3x + 3)
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!