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
LenKa [72]
3 years ago
14

Basic compounds produce OH- ions when dissolved in water. true or false

Mathematics
1 answer:
Ket [755]3 years ago
4 0

Answer:


Step-by-step explanation:


You might be interested in
The following table shows the percent increase of donations made on behalf of a non-profit organization for the period of 1984 t
pashok25 [27]
Giving the table below which shows <span>the percent increase of donations made on behalf of a non-profit organization for the period of 1984 to 2003.
</span>
Year:        1984     1989     1993     1997     2001     2003

Percent:    7.8       16.3       26.2      38.9     49.2      62.1

The scatter plot of the data is attached with the x-axis representing the number of years after 1980 and the y-axis representing the percent increase <span>of donations made on behalf of a non-profit organization.

To find the equation for the line of regression where </span><span>the x-axis representing the number of years after 1980 and the y-axis representing the percent increase of donations made on behalf of a non-profit organization.
\begin{center}&#10;\begin{tabular}{ c| c| c| c| }&#10; x & y & x^2 & xy \\ [1ex] &#10; 4 & 7.8 & 16 & 31.2 \\  &#10; 9 & 16.3 & 81 & 146.7 \\ &#10;13 & 26.2 & 169 & 340.6 \\ &#10;17 & 38.9 & 289 & 661.3 \\ &#10;21 & 49.2 & 441 & 1,033.2 \\ &#10;23 & 62.1 & 529 & 1,428.3 \\ [1ex]&#10;\Sigma x=87 & \Sigma y=200.5 & \Sigma x^2=1,525 & \Sigma xy=3,641.3  &#10;\end{tabular}&#10;\end{center}
</span>
Recall that the equation of the regression line is given by
y=a+bx
where
a= \frac{(\Sigma y)(\Sigma x^2)-(\Sigma x)(\Sigma xy)}{n(\Sigma x^2)-(\Sigma x)^2} = \frac{200.5(1,525)-87(3,641.3)}{6(1,525)-(87)^2}  \\  \\ = \frac{305,762.5-316793.1}{9,150-7,569} = \frac{-11,030.6}{1,581} =-6.977
and
b= \frac{n(\Sigma xy)-(\Sigma x)(\Sigma y)}{n(\Sigma x^2)-(\Sigma x)^2} = \frac{6(3,641.3)-(87)(200.5)}{6(1,525)-(87)^2}  \\  \\ = \frac{21,847.8-17,443.5}{9,150-7,569} = \frac{4,404.3}{1,581} =2.7858

Thus, the equation of the regresson line is given by
y=-6.977+2.7858x

The graph of the regression line is attached.

Using the equation, we can predict the percent donated in the year 2015. Recall that 2015 is 35 years after 1980. Thus x = 35.

The percent donated in the year 2015 is given by
-6.977+2.7858(35)=-6.977+97.503=90.526

Therefore, the percent donated in the year 2015 is predicted to be 90.5

7 0
3 years ago
Which expression is equivalent to 24x + 12?
Lyrx [107]

You can factor 12 from both terms to get

24x+12 = 12(2x+1)

7 0
3 years ago
What is translation with 5 units right and 1 up
Leviafan [203]
Since you did not provide the coordinates, I can't provide an exact answer. 
However, I can tell you this; from the initial x-coordinate, move right 5 units. from the initial-y coordinate, move up 1 unit and you will have your answer. 
4 0
3 years ago
Find the lowest common denominator for this pair of
Ganezh [65]

Answer:

b

Step-by-step explanation:

3 0
3 years ago
You are charged 6.5% tax on a 42% purchase. Find the amount of tax
Rus_ich [418]
Assuming you means 6.5% tax of a $42 purchase

0.065*42=2.73

tax is $2.73
7 0
3 years ago
Other questions:
  • How many millimeter are there in 5 kilometers ​
    6·2 answers
  • Adding negative numbers<br> Add.<br> -7 +4=
    7·2 answers
  • How do you find the inequality for a triangle when it only gives you two sides
    7·1 answer
  • How do I find the surface area of a cube and a square pyramid?
    6·1 answer
  • If the slope of the line is 3, indicate whether the line through the point rises, falls, horizontal, or vertical
    7·1 answer
  • frankie calculated that she would need 9.5 yards of wallpaper to decorate her room. The wallpaper she chose had a large pattern,
    13·1 answer
  • Please help me answer this:) <br><br> Will give you brainlst ^
    6·1 answer
  • Please Help- Worth 15 Points (NO SCAM ANSWERS)
    15·1 answer
  • What is the next term of the geometric sequence?<br> -1/7,4/7,-16/7
    7·1 answer
  • 6. a) The mid point of a line segment is (1,-1) whose one end is (-1, -3). Find the other end. ​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!