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
Pani-rosa [81]
2 years ago
10

Find the solution of the system of equations.

Mathematics
1 answer:
irina1246 [14]2 years ago
4 0

Answer:

x = -5 ;  y= -1

Step-by-step explanation:

10y = -10

y = -1

-8x = 44 -4

-8x = 40

x = -5

You might be interested in
Evaluate. 75-2(9-5)²+2³
Andreyy89
75-2(9-5)^2+2^3

First, solve the parentheses:

75-2(4)^2+2^3

Next, the exponential terms

75-2(16)+8

Solve the multiplication:

75-32+8

Add and subtract:

51

5 0
1 year ago
What is the value of y?<br><br> Enter your answer in the box. <br><br> y= ??
kenny6666 [7]

Answer:

64

Step-by-step explanation:

total of a triangle adds up to 180 degrees

so:

76+37=116

180-116=64

8 0
2 years ago
Read 2 more answers
Helpppppp please please
GenaCL600 [577]
3/10=4/x
3x=10(4)
3x=40
x=13.33
8 0
3 years ago
To compare two programs for training industrial workers to perform a skilled job, 20 workers are included in an experiment. Of t
nikklg [1K]

Answer:

t=\frac{19.1-23.3}{\sqrt{\frac{4.818^2}{10}+\frac{5.559^2}{10}}}}=-1.805  

p_v =P(t_{(18)}

If we compare the p value and the significance level assumed \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can conclude the the true mean for method 1 is lower than the mean for the method 2 at 5% of significance

Step-by-step explanation:

Data given and notation

We can calculate the sample mean and deviation with these formulas:

\bar X = \frac{\sum_{i=1}^n X_i}{n}

s= \sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}

\bar X_{1}=19.1 represent the mean for the sample mean for 1

\bar X_{2}=23.3 represent the mean for the sample mean for 2

s_{1}=4.818 represent the sample standard deviation for the sample 1

s_{2}=5.559 represent the sample standard deviation for the sample 2

n_{1}=10 sample size selected 1

n_{2}=10 sample size selected 2

\alpha 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 check if the average time taken when training under method 1 is less than the average time for Method 2, the system of hypothesis would be:

Null hypothesis:\mu_{1} \geq \mu_{2}

Alternative hypothesis:\mu_{1} < \mu_{2}

If we analyze the size for the samples both are less than 30 so for this case is better apply a t test to compare means, and the statistic is given by:

t=\frac{\bar X_{1}-\bar X_{2}}{\sqrt{\frac{s^2_{1}}{n_{1}}+\frac{s^2_{2}}{n_{2}}}} (1)

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other".

Calculate the statistic

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

t=\frac{19.1-23.3}{\sqrt{\frac{4.818^2}{10}+\frac{5.559^2}{10}}}}=-1.805  

P-value

The first step is calculate the degrees of freedom, on this case:

df=n_{1}+n_{2}-2=10+10-2=18

Since is a one sided test the p value would be:

p_v =P(t_{(18)}

Conclusion

If we compare the p value and the significance level assumed \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can conclude the the true mean for method 1 is lower than the mean for the method 2 at 5% of significance

4 0
2 years ago
How many parallel sides can a triangl have
katrin2010 [14]

Answer:

None.

Step-by-step explanation:

Hi!!

A triangle has <u>NO</u> parrallel lines. It cannot. Think of a triangle. IF it had a parralell line(s), it would not have 3 sides.

Otherwise, it wouldn't be a polygon which is part of the criteria for a triangle.

Hope this helps!

:D

5 0
3 years ago
Read 2 more answers
Other questions:
  • What is the smallest solution to this equation?​
    5·1 answer
  • The sign of the product of 2 integers with the same sign is positive. what is the sign of the product of 3 integers with the sam
    11·1 answer
  • A restaurant investigated the correlation between prices and the number of customers. The linear model below represents this sit
    15·1 answer
  • Solve for x: −2x + 5 &lt; 7
    13·1 answer
  • What is 2+2 jfkkrhjkorowjeurkfbrbrjjrjrfj
    7·2 answers
  • The United States has a total area of 3,796,742 square miles.
    15·1 answer
  • Cho tam giác abc có góc b=60 độ cạnh b= 4cm cạnh c=5cm . tính độ dài cạnh a
    15·1 answer
  • Given that A, O &amp; B lie on a straight line segment, evaluate COD.
    12·2 answers
  • F(x) = x2. What is g(x)?
    14·1 answer
  • <img src="https://tex.z-dn.net/?f=%24a%2Ba%20r%2Ba%20r%5E%7B2%7D%2B%5Cldots%20%5Cinfty%3D15%24%24a%5E%7B2%7D%2B%28a%20r%29%5E%7B
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!