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
12

An index has a length of 7 cm and width of 4 cm. What it’s perimeter?

Mathematics
1 answer:
Mekhanik [1.2K]3 years ago
7 0

Answer:

22

Step-by-step explanation:

7+7+4+4=22

You might be interested in
Doctor Forrest charges $60 for a home visit plus an additional fee of $12.50 per hour spent with the patient. Doctor Forrest arr
MAXImum [283]

Answer: 12:30 p.m

Step-by-step explanation:

h=hours

97.5=60+12.5h

12.5h=37.5

h=3

9:30 a.m.+h=

9:30 a.m.+ 3=12:30 p.m

8 0
2 years ago
An engineer designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such tha
andrew-mc [135]

Answer:

z=\frac{7.4-7.6}{\frac{0.9}{\sqrt{130}}}=-2.534    

z_{\alpha}=-2.054

If the calculated value is less than the critical value we reject the null hypothesis.

P value

The p value for this test would be:  

p_v =P(Z  

Since the p value is lower than the significance level given we have enough evidence to reject the null hypothesis at the 25 of significance level given.

Step-by-step explanation:

Information given

\bar X=7.6 represent the sample mean

\sigma=0.9 represent the population deviation

n=130 sample size  

\mu_o =7.4 represent the value that we want to check

\alpha=0.02 represent the significance level for the hypothesis test.  

z would represent the statistic

p_v represent the p value for the test

System of hypothesis  

We want to check if the mean pressure is less then 7.6 pounds/square inch, the system of hypothesis are:  

Null hypothesis:\mu \geq 7.6  

Alternative hypothesis:\mu < 7.6  

The statistic would be:

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

Replacing the values we got:

z=\frac{7.4-7.6}{\frac{0.9}{\sqrt{130}}}=-2.534    

Critical value

we need to find a critical value who accumulates 0.02 of the area in the left of the normal standard distribution and we got:

z_{\alpha}=-2.054

If the calculated value is less than the critical value we reject the null hypothesis.

P value

The p value for this test would be:  

p_v =P(Z  

Since the p value is lower than the significance level given we have enough evidence to reject the null hypothesis at the 25 of significance level given.

3 0
3 years ago
Are the following fractions proportional?? .4/.8 and .71/.4
Neporo4naja [7]

Answer:

yes they are

Step-by-step explanation:

see nobody answers correctly:)

4 0
3 years ago
Que
Mila [183]

Answer:

2

Step-by-step explanation:

Because if you add 1  to 8 you get 9 then subtract 9 by 7 then and your answer is 2

7 0
2 years ago
Read 2 more answers
What is the measure of an exterior angle in a regular 19-gon?
Mashutka [201]
The measure is about 19!
7 0
3 years ago
Other questions:
  • What is the value of x? 7.2/8.4 = x/36.1
    10·1 answer
  • Bryan paid a sale price of $45 for a video game. What is the original price if the discount was 25% off?
    14·1 answer
  • WILL MARK BRAINLIEST NEED DONE NOW
    11·1 answer
  • Label from least to greatest 1/3, 5/6, 1/8, 7/12
    10·1 answer
  • Whats 4 +4 <br><br> guys pls help
    5·2 answers
  • Please answer quick! Will give Brainliest, 5 stars, and I will like your answer!!
    9·2 answers
  • Hey I need to know how to get standard form from two coordinates. I need this asap.
    11·1 answer
  • What is the value of the expression 15 x 6 - 2^2 x 8 + 4^3
    12·1 answer
  • 28. Marta Sanchez purchased a sweater for $15.67, a pair of socks for $2.13, and a bracelet for $6.78. For all
    5·1 answer
  • A line contains the point (-3,4). If the slope of the line is -2/3, write the equation of the line using slope intercept form
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!