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
Salsk061 [2.6K]
4 years ago
11

Which number completes the square? x^2-4x?

Mathematics
1 answer:
ruslelena [56]4 years ago
4 0
X^2-4x=0 Let x=0 0^2=4(0)=0 0=0 [checks out] and x^2-4x=0 (4)^2-4(4)x=0 16-16=0 0=0 [also checks out]
You might be interested in
Suppose that each observation in a random sample of 100 fatal bicycle accidents in 2015 was classified according to the day of t
liraira [26]

Answer:

The calculated χ² =  0.57   does not fall in the critical region χ² ≥  12.59  so we fail to reject the null hypothesis and conclude the proportion of fatal bicycle accidents in 2015 was the same for all days of the week.

Step-by-step explanation:

1) We set up our null and alternative hypothesis as

H0:  proportion of fatal bicycle accidents in 2015 was the same for all days of the week

against the claim

Ha:  proportion of fatal bicycle accidents in 2015 was not the same for all days of the week

2) the significance level alpha is set at 0.05

3) the test statistic under H0 is

χ²= ∑ (ni - npi)²/ npi

which has an approximate chi square distribution with ( n-1)=7-1=  6 d.f

4) The critical region is χ² ≥ χ² (0.05)6 = 12.59

5) Calculations:

χ²= ∑ (16- 14.28)²/14.28 + (12- 14.28)²/14.28 + (12- 14.28)²/14.28 + (13- 14.28)²/14.28 + (14- 14.28)²/14.28 + (15- 14.28)²/14.28 + (18- 14.28)²/14.28

χ²= 1/14.28 [ 2.938+ 5.1984 +5.1984+1.6384+0.0784 +1.6384+13.84]

χ²= 1/14.28[8.1364]

χ²= 0.569= 0.57

6) Conclusion:

The calculated χ² =  0.57   does not fall in the critical region χ² ≥  12.59  so we fail to reject the null hypothesis and conclude the proportion of fatal bicycle accidents in 2015 was the same for all days of the week.

b.<u> It is r</u>easonable to conclude that the proportion of fatal bicycle accidents in 2015 was the same for all days of the week

6 0
3 years ago
Find the value of expression m(m-n) for m=3 and n=1<br><br><br> I need the ANSWER ASAP
Alex73 [517]

Answer:

6

Step-by-step explanation:

m = 3

n = 1

Equation

m(m - n)     Substitute the givens

Solution

3(3 -1 )        Evaluate what is inside the brackets.

3(2)      multiply

6

7 0
4 years ago
Determine whether the random variable is discrete or continuous. In each​ case, state the possible values of the random variable
ruslelena [56]

Answer:

a) Discrete. It can be 2 or 3.

b) Continuous. It can be bigger than 700 hours.

Step-by-step explanation:

​(a) The number of free dash throw attempts before the first shot is made free-throw attempts before the first shot is made.

Discrete variables assumes finite number of isolated values. We can count the number of free dash throw attempts before the first shot is made, therefore this variable is discrete.

b) The time it takes for a light bulb to burn out time, it takes for a light bulb to burn out.

Continuous variables assume a value in a range rather than a set of finite numbers. Time is not countable but measurable. Therefore this variable is continuous.

6 0
3 years ago
A 6am one morning the temperature was -14 degrees by noon it rose 8 degrees and then rose another 2 degrees by 3pm. By 6pm the t
valentina_108 [34]

Answer:

-9 degrees

Step-by-step explanation:

-14 + 8 = -6

-6 + 2 = -4

-4 - 5 = -9

3 0
3 years ago
Rewrite the expression (x2 – 3x – 18)/(x – 9) using the long division method.
nadezda [96]

Answer:

<em>x + 3</em>

Step-by-step explanation:

<em>Image below</em>

7 0
3 years ago
Other questions:
  • If you shift the linear parent function, f(x) = x, up 6 units, what is the equation of the new function?
    9·1 answer
  • Jones Manufacturing offers chain discounts of 5/4/2 to many of its preferred customers. Rowly Dress Shop purchased 40 dresses th
    15·1 answer
  • An airplane flies at a constant speed of 800 MPH. how far can it travel in 3 1/2 hours
    5·2 answers
  • 40% of what number is 14
    10·1 answer
  • Mr. Thomas wants each of his students to have 1/4 pound of clay for the project. If he has 32 students, how much clay will he ne
    8·1 answer
  • Please help me with this!
    6·1 answer
  • I need help now please .
    10·1 answer
  • Someone please help me ASAP! Worth 10 points
    9·2 answers
  • Isabel wants to start saving more money so that she can purchase new clothes for college. She has $200 and will add $5 to her sa
    15·1 answer
  • Which of the following sets of ordered pairs is NOT a function?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!