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
Alekssandra [29.7K]
3 years ago
15

Solve the following system of equations algebraically: x2 + y2 = 20 2y = x

Mathematics
1 answer:
MaRussiya [10]3 years ago
4 0

Answer:

x = 5

Step-by-step explanation:

x2 + y2 = 20

xy = 20 ÷ 2 ÷2

= 10 ÷ 2

x = 5

i dont know whether this is right

but hope it helps n it works

You might be interested in
The area of the rug is 36 1/4 square feet the rug is 8 3/4. what is the length of the rug?
loris [4]
Area=legnth times width

36 and 1/4=8 and 3/4 times width

conver to imrpoer
36 and 1/4=145/4
8 and 3/4=35/4

145/4=35/4 times x
times both sides by 4
145=35 times x
divide both sides by 35
29/7=x
4 and 1/7=x

answer is 4 and 1/7=legnth
7 0
3 years ago
When you subtract a number, you get the same results as when you add the opposite number. Why?
lapo4ka [179]

Answer:

Step-by-step explanation:

Well, the opposite of a number is the same number with the opposite sign. For example, the opposite of -1 is 1.

So, say we have an equation where we're subtracting a number, for example, 2-1, which obviously equals 1. Now, if we add the opposite of 1 to 2, we get the equation 2+(-1) which still equals 1.

I hope this helps!

4 0
2 years ago
Identify the domain and range of the function graphed below. <br><br><br><br>​
Vladimir [108]

Answer:

Domain: (-∞, 4]

Range: [0, ∞)

General Formulas and Concepts:

<u>Algebra I</u>

  • Domain is the set of x-values that can be inputted into function f(x)
  • Range is the set of y-values that are outputted by function f(x)

Step-by-step explanation:

According to the graph, we see the line's x-value span from negative infinity to 4. Since 4 is closed dot, it is inclusive in the domain:

(-∞, 4] or x ≤ 4

According to the graph, we see the line's y-value span from 0 to infinity. Since 0 is closed dot, it is inclusive in the range:

[0, ∞) or y ≥ 0

8 0
3 years ago
According to a polling​ organization, 24% of adults in a large region consider themselves to be liberal. A survey asked 200 resp
Varvara68 [4.7K]

Answer:

z=\frac{0.375 -0.24}{\sqrt{\frac{0.24(1-0.24)}{200}}}=4.47  

Now we can calculate the p value based on the alternative hypothesis with this probability:

p_v =P(z>4.47)=0.00000391  

The p value is very low compared to the significance level of \alpha=0.05 then we can reject the null hypothesis and we can conclude that the true proportion of people liberal is higher than 0.24

Step-by-step explanation:

Information given

n=200 represent the random sample taken

X=75 represent the number of people Liberal

\hat p=\frac{75}{200}=0.375 estimated proportion of people liberal

p_o=0.24 is the value that we want to test

z would represent the statistic

p_v represent the p value

Hypothesis to test

We want to verify if the true proportion of adults liberal is higher than 0.24:

Null hypothesis:p \leq 0.24  

Alternative hypothesis:p > 0.24  

The statistic is given by:

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

Replacing the info given we got:

z=\frac{0.375 -0.24}{\sqrt{\frac{0.24(1-0.24)}{200}}}=4.47  

Now we can calculate the p value based on the alternative hypothesis with this probability:

p_v =P(z>4.47)=0.00000391  

The p value is very low compared to the significance level of \alpha=0.05 then we can reject the null hypothesis and we can conclude that the true proportion of people liberal is higher than 0.24

6 0
3 years ago
Is 70x8=490 pls answer
Anna71 [15]

Answer:

No

Step-by-step explanation:

70 * 8 = 560, not 490

Instead, 70 * 7 = 490

4 0
2 years ago
Read 2 more answers
Other questions:
  • Myles's school is selling tickets to an end of the year
    15·1 answer
  • A new cruise ship line has just launched 3 new​ ships: the Pacific​ Paradise, the Caribbean​ Paradise, and the Mediterranean Par
    10·1 answer
  • 132891 round the nerast hundred
    6·1 answer
  • 2x + 5y = 0 <br> x - 5y = -15
    11·1 answer
  • Solve write or draw to explain Saul and Luisa each scored 167 points on computer games How many points did they score together
    7·1 answer
  • The cone shown has a diameter of 18 meters and a slant height of 15 meters. Which choice is the closest to the lateral surface a
    11·1 answer
  • Hidaya is mailing packages. Each small package costs her $2.40 to send. Each large package costs her S3.70. How much will it cos
    7·2 answers
  • I need help with this
    13·1 answer
  • PLSSS HELP IF YOU TURLY KNOW THISS
    11·2 answers
  • I have a riddle <br> Which one has two zero and two four?<br> A.0024<br> B.2024<br> C.0044
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!