Answer:
7.67
Step-by-step explanation:
Given the data :
Week_sales_Forecast ___|error|_ |error|²
1 _____15
2 ____ 16
3 ____ 19
4 ____ 18
5 ____ 19 ____ 17 _______ 2____4
6 ____ 20 ___ 18 ________2____4
7 ____ 19 ____19 ________0____0
8 ___ 22 ____ 19 ________3____9
9 ___ 15 ____ 20 ________5___ 25
10 __ 21 _____19 ________ 2 ___ 4
Mean squared error :
(4 + 4 + 0 + 9 + 25 + 4) / 6
= 46 / 6
= 7.666
= 7.67
Please, one problem at a time. Haven't you started any of these?
What is a+b? Write out a and b, one over the other, and then combine like terms:
1i + 4j
-4i - j
-----------
-3i + 3j (answer to "a+b").
Please try some of the other problem, sharing your work or at least asking questions whose answers might help you get started.
Answer:
The inputs to this formula are:
- The x-coordinate of the point: ;
- The y-coordinate of the point: ; and
- The slope of the line: .
The equation of this line in point-slope form will be:
.
Step-by-step explanation:
The general form of a 2D line in its point-slope form is:
.
This form of the equation of a line takes two pieces of information:
- The x-y coordinate of a point on the line , and
- The slope (a.k.a. gradient) of that line.
For this line, the point is .
- , and
- .
The slope of this line is . In other words,
- .
Apply the point-slope formula for a 2D line:
.
.
Answer: sometimes
Step-by-step explanation: Three points are <em>sometimes</em> collinear.
In the diagram shown, points B, G, and A are collinear
because these points all lie on the same line.
However, let's look at points A, B, and D.
Since points A, B, and D do not all lie
on the same line, they aren't collinear.
So we know that three points can sometimes be collinear.
The answer is in the attached photo!
Hope I helped~! :)