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
STALIN [3.7K]
3 years ago
10

Can anybody help me with number 20....just number 20 plz?....thank u

Mathematics
1 answer:
MatroZZZ [7]3 years ago
6 0
The property used in #20 was called 'the distributive property'.

This property gets rid of the parenthesis and also gets the expression more simple. 

x(y+b)
x*y + x*b              ⇔ Notice the change here? 

Answer would be: Distributive property 

You might be interested in
Which one is not true?
Charra [1.4K]

Answer:

D

Step-by-step explanation:

-61>-10>0 is not true

The greater the negative number is the smaller it becomes.

8 0
3 years ago
The total amount of time university students in the United States spend sleeping grooming, eating and drinking, and traveling is
kolezko [41]

Answer:

yes

Step-by-step explanation:

6 0
3 years ago
X² - 36= x² - y²= 100 - a²= c² - 9/49=
bixtya [17]

Answer:

78

Step-by-step explanation:

i am using my sisters account hehe thats what u get for taking a shortcut boyyyyyyyyyy

7 0
3 years ago
• A researcher claims that less than 40% of U.S. cell phone owners use their phone for most of their online browsing. In a rando
antiseptic1488 [7]

Answer:

We failed to reject H₀

Z > -1.645

-1.84 > -1.645

We failed to reject H₀

p > α

0.03 > 0.01

We do not have significant evidence at a 1% significance level to claim that less than 40% of U.S. cell phone owners use their phones for most of their online browsing.

Step-by-step explanation:

Set up hypotheses:

Null hypotheses = H₀: p = 0.40

Alternate hypotheses = H₁: p < 0.40

Determine the level of significance and Z-score:

Given level of significance = 1% = 0.01

Since it is a lower tailed test,

Z-score = -2.33 (lower tailed)

Determine type of test:

Since the alternate hypothesis states that less than 40% of U.S. cell phone owners use their phone for most of their online browsing, therefore we will use a lower tailed test.

Select the test statistic:  

Since the sample size is quite large (n > 30) therefore, we will use Z-distribution.

Set up decision rule:

Since it is a lower tailed test, using a Z statistic at a significance level of 1%

We Reject H₀ if Z < -1.645

We Reject H₀ if p ≤ α

Compute the test statistic:

$ Z =  \frac{\hat{p} - p}{ \sqrt{\frac{p(1-p)}{n} }}  $

$ Z =  \frac{0.31 - 0.40}{ \sqrt{\frac{0.40(1-0.40)}{100} }}  $

$ Z =  \frac{- 0.09}{ 0.048989 }  $

Z = - 1.84

From the z-table, the p-value corresponding to the test statistic -1.84 is

p = 0.03288

Conclusion:

We failed to reject H₀

Z > -1.645

-1.84 > -1.645

We failed to reject H₀

p >  α

0.03 > 0.01

We do not have significant evidence at a 1% significance level to claim that less than 40% of U.S. cell phone owners use their phones for most of their online browsing.

8 0
3 years ago
What is the product of Negative StartFraction 2 over 7 EndFraction and Negative StartFraction 3 over 7 EndFraction?
Andrew [12]

Answer:

your answer is d

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • If x= and y = 8, consider the sum of x and y. Which statement
    14·1 answer
  • Whats the value of -9(8.15)​
    15·2 answers
  • (this is multiple choice and i raised points make sure to EXPLAIN !)
    13·2 answers
  • Find the number, if 80% of it is 6.4
    13·1 answer
  • The tape diagram shows the ratio of boys to girls at 4:5. If there are 275 total girls. How many boys are there?
    8·2 answers
  • Please help with this quick! Your answer will be appreciated or be given a thanks and a 5 star! If 2 people answer and yours mak
    14·1 answer
  • One way of checking the effect of undercoverage, nonresponse, and other sources of error in a sample survey is to compare the sa
    8·1 answer
  • Wut is 2+2 i willy need hewp pwease
    6·1 answer
  • I NEED HELP ✋!!!!!!!!!!!!!!!!!!!L!!!!!!!!!!!!
    12·1 answer
  • There are 9 teachers and 5 aides at the Hills Elementary School. What is the ratio of teachers to all adults?​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!