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
r-ruslan [8.4K]
3 years ago
11

Please help! Add using a number line −2/5 +4/5 = ?

Mathematics
1 answer:
kobusy [5.1K]3 years ago
5 0

-  \frac{2}{5}  +  \frac{4}{5}  =  \frac{2}{5}
You might be interested in
Grades on a standardized test are known to have a mean of 1000 for students in the United States. The test is administered to 45
krok68 [10]

Answer:

a

The 95% confidence interval is 1003  <  \mu

b

Yes there is statistically significant evidence that students in Florida perform differently from other students in the United States

Step-by-step explanation:

From the question we are told that

   The population mean is  \mu =  1000

   The sample size is  n =  453

   The sample mean is  \= x  = 1013

    The standard deviation is s =  108

   

Given that the confidence level is  95% then the level of significance is mathematically represented as

            \alpha  =  100 - 95

=>         \alpha  =  5\%

=>          \alpha  = 0.05

The critical value  for \frac{\alpha }{2} obtained from the normal distribution table is          

          Z_{\frac{\alpha }{2} } =  1.96

Generally the margin of error is mathematically represented as

         E =  Z_{\frac{\alpha }{2} } *  \frac{s}{\sqrt{n} }

=>     E =  1.96 *  \frac{108}{\sqrt{453} }

=>      E = 9.946

Generally the 95% confidence interval is mathematically represented as

           \= x  - E  <  \mu <  \= x + E

=>         1013  - 9.946  <  \mu < 1013  + 9.946

=>         1003  <  \mu

Given that the population mean(1000) is not within the 95% confidence interval for l for the average test score for students in Florida, then it means that there is statistically significant evidence that students in Florida perform differently from other students in the United States

 

4 0
3 years ago
What kind of equations have the greatest outputs?
stepladder [879]

Answer:

Exponential

Step-by-step explanation:

8 0
3 years ago
What can you tell about the mean of each
Lilit [14]

Answer: The difference between the mean cost to treat dogs at A New Leash on Life

Animal Clinic and the mean cost to treat cats at A New Leash on Life Animal

Clinic is about 10 times the MAD This is a large difference.

Step-by-step explanation:

I GOT THIS RIGHT! THIS IS THE ANSWER

3 0
3 years ago
How many sides does a polygon have if the sum of its angle measures is 2700 degrees and how do you find this?
ss7ja [257]
The number of angles equal the number of sides


The number of angles calculate: (n-2)x180°

(n-2)x180°=2700°    |divide both sides by 180°

n-2=15    |add 2 to both siedes

n=13

Answer: 13 sides.


6 0
3 years ago
Read 2 more answers
A bakery sells 5 bagels for 7.50.There is a proportion relationship between the cost and the number of bagels,Which equation rep
timama [110]

Answer:

$1.5b

Step-by-step explanation:

If a bakery sells 5 bagels for $7.50, we are to find the equation that will represent the cost of b bagels. This can be gotten using the equality postulate as shown;

5 bagels = $7.50

b bagel = $c

Cross multiply

5*c = 7.50b

Divide both sides by 5

5c/5 = 7.50b/5

c = 1.5b

Hence  the cost of b bagel c is $1.5b

5 0
3 years ago
Read 2 more answers
Other questions:
  • Where is the function constant? Choose all answers that are correct. A.from x = −5 to x = −2 B.from x = −2 to x = 1 C.from x = 1
    13·1 answer
  • Write an equation of a line with the given slope and y-intercept. m = 1, b = 4 a) y = x – 4 b) y = –1x + 4 c) y = x + 4 d) y = 4
    7·2 answers
  • Pls hurry I’m running out of time<br><br> Will mark brainliest
    13·1 answer
  • What is the justification for the first step in proving the formula for factoring the sum of cubes?
    9·1 answer
  • Which statement is false?
    13·2 answers
  • Determine the validity of the following argument. If one of the arguments is listed in the text, please name it: If n is a real
    8·1 answer
  • What is the difference between smart card and cash card?
    15·2 answers
  • Answers to 1000-799 plz tell me right answer plz
    12·1 answer
  • Gabriella walks every 3 days Mona walks every 5 days. How many days until they walk again on the same day?
    14·1 answer
  • Bruno and Amelia have 112 newspapers to deliver. Bruno delivers three fourths of the news papers, Amelia delivers one seventh pf
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!