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
lozanna [386]
3 years ago
13

Janene has 12 ⅔ yards of ribbon and 8⅓ yards of gold ribbon. How much ribbon does janene have in all

Mathematics
1 answer:
SIZIF [17.4K]3 years ago
6 0

Answer:

21 yards

Step-by-step explanation:

12 + 8 = 20

2/3 + 1/3 = 1

20 + 1 =  21 yards of gold ribbon

You might be interested in
A laptop producing company also produces laptop batteries, and claims that the batteries
gregori [183]

Answer:

There is enough evidence to support the claim that the batteries power the laptops for significantly less than 4 hours. (P-value = 0).

The null and alternative hypothesis are:

H_0: \mu=4\\\\H_a:\mu< 4

Step-by-step explanation:

<em>The question is incomplete: To test this claim a sample or population standard deviation is needed.</em>

<em>We will estimate that the sample standard deviation is 2 hours, and use a t-test to test that claim.</em>

<em> NOTE (after solving): The difference between the sample mean and the mean of the null hypothesis is big enough to reject the null hypothesis, even when we have a sample standard deviation of 3.5 hours, which can be considered bigger than the maximum standard deviation for the sample.</em>

This is a hypothesis test for the population mean.

The claim is that the batteries power the laptops for significantly less than 4 hours.

Then, the null and alternative hypothesis are:

H_0: \mu=4\\\\H_a:\mu< 4

The significance level is 0.05.

The sample has a size n=500.

The sample mean is M=3.5.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=2.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{2}{\sqrt{500}}=0.0894

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{3.5-4}{0.0894}=\dfrac{-0.5}{0.0894}=-5.5902

The degrees of freedom for this sample size are:

df=n-1=500-1=499

This test is a left-tailed test, with 499 degrees of freedom and t=-5.5902, so the P-value for this test is calculated as (using a t-table):

P-value=P(t

As the P-value (0) is smaller than the significance level (0.05), the effect is  significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the batteries power the laptops for significantly less than 4 hours.

5 0
3 years ago
Given m|n, find the value of x.
yaroslaw [1]
X=12


Because 180-168= 12
7 0
3 years ago
In a survey, 150 shoppers were asked whether they have access to a computer at home and if they have a personal e-mail account.
rosijanka [135]
I don't know what you are talking about please re word the question its really hard to understand what your asking.
8 0
3 years ago
Use the digits 5,4 and 8 once each to write an odd number greater than seven hundred
natali 33 [55]
845 because 800 is greater than 700 and 845 is an odd number because it ends in 5 (which is an odd number).
4 0
3 years ago
Happy halloween every one <br><br><br><br> sorry moderators today i want to pass my spirit today
Kamila [148]

Answer:

Happy Halloween!!!

Step-by-step explanation:

Hope I made your day better buddy.

Brainliest??

7 0
3 years ago
Read 2 more answers
Other questions:
  • How did the enlightenment affect peoples attitudes toward political authority
    9·2 answers
  • A group of objects or numbers is called
    5·2 answers
  • Factorise 6x^3+23x^2-41x-42
    14·1 answer
  • Does anyone know the formula for finding the area of a circles sector
    10·1 answer
  • Answer quickly pls!!!! The two-way table below shows the number of students in a school who like hockey and/or football: (pic sh
    9·2 answers
  • A motor scooter purchased for $1,000 depreciates at an annual rate of 15%. Write an exponential function, and graph the function
    13·1 answer
  • GIVING AWAY 10 POINTS!!!!!! What is the solution to the system of equations? x = y + 4
    5·1 answer
  • Real fourth roots of 81
    11·2 answers
  • Find the circumference of the circle.Use 3.14 for pi<br> 10 mm
    7·1 answer
  • Please help
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!