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
Lyrx [107]
3 years ago
15

Brainliest is given to whoever explains well and why your answer's the right 1.

Mathematics
1 answer:
kolezko [41]3 years ago
8 0

Answer:

it is a. because x+y you can not add them because they don't have the same variable and zero is by itself so thats why it is correct

Step-by-step explanation:

You might be interested in
The bills won 57.1% of their 140 games last year. How many did they win
antoniya [11.8K]

Answer:

79.94

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
The table below shows the distance a car travels and the amount of gasoline left in the tank of the car. Distance Traveled and G
hichkok12 [17]

Answer:

b: 4

Step-by-step explanation:

i took the test on edge 2020

4 0
3 years ago
Read 2 more answers
Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and
Brums [2.3K]

Answer:

t=\frac{51.6-48}{\frac{1.1}{\sqrt{10}}}=10.349      

p_v =P(t_9>10.349)=1.34x10^{-6}  

If we compare the p value and the significance level given for example \alpha=0.05 we see that p_v so we can conclude that we reject the null hypothesis, and the the actual mean is significantly higher than 48 MPa at 5% of significance.

Step-by-step explanation:

1) Data given and notation      

\bar X=51.6 represent the sample mean

s=1.1 represent the standard deviation for the sample      

n=10 sample size      

\mu_o =48 represent the value that we want to test    

\alpha=0.05 represent the significance level for the hypothesis test.    

t would represent the statistic (variable of interest)      

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.      

We need to conduct a hypothesis in order to determine if the mean score is higher than 48, the system of hypothesis would be:      

Null hypothesis:\mu \geq 48      

Alternative hypothesis:\mu > 48      

We don't know the population deviation, so for this case is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:      

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

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic      

We can replace in formula (1) the info given like this:      

t=\frac{51.6-48}{\frac{1.1}{\sqrt{10}}}=10.349      

Calculate the P-value      

First we find the degrees of freedom:

df=n-1=10-1=9

Since is a one-side upper test the p value would be:      

p_v =P(t_9>10.349)=1.34x10^{-6}  

Conclusion      

If we compare the p value and the significance level given for example \alpha=0.05 we see that p_v so we can conclude that we reject the null hypothesis, and the the actual mean is significantly higher than 48 MPa at 5% of significance.        

5 0
3 years ago
How do you solve f(x) = x2 + x - 20?​
Darina [25.2K]

\huge \bf༆ Answer ༄

Let's solve ~

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \: {x}^{2}  + x - 20

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \: {x}^{2}  + 5x - 4x - 20

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:x(x + 5) - 4(x + 5)

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:(x + 5)(x -  4)

It's factorized now ~ And if you want to find the zeros then equate the expression with 0.

And you will get ;

{ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:x =  - 5 \:  \: and \:  \: 4

4 0
2 years ago
Find the solution set of 5x<36 when x ∈ n
Margaret [11]

Answer:

5x<36

5x/5 < 36/5

x < 7.2

4 0
3 years ago
Read 2 more answers
Other questions:
  • Helppppppp pleaseeeeee
    7·2 answers
  • Find the midpoint and length between each pair of points. (5,5) (-1,3)<br><br> PLEASE HELP!!
    9·1 answer
  • If you place a 65-foot ladder against the top a 16-foot building ,how many feet will the bottom of ladder be from the bottom of
    12·1 answer
  • Three machines operating independently, simultaneously, and at the same constant rate can fill a certain production order in 36
    5·1 answer
  • Sam recorded the number of points she scored on each weekly test out of the number of points possible for the test. In which two
    15·1 answer
  • A triangle has one angle that measures 29 degrees, one angle that measures 116 degrees, and one angle that measures 35 degrees.
    13·1 answer
  • Help please I’m struggling badly because Im bad at math
    9·2 answers
  • 11(n-3)=-4<br><br> this is also for my friend
    10·2 answers
  • The sum of a number and 9, times 12
    14·1 answer
  • Need a well explained ans ...<br>● no spams needed <br>​
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!