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kykrilka [37]
3 years ago
13

"The fitted regression line will always run through the mean of the observed data. In other words, the point (x with bar on top,

y with bar on top) will always lie on the estimated (fitted) regression line. Is it true or false?"
Mathematics
1 answer:
Kamila [148]3 years ago
6 0
Great question goodluck in the future
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What is the slope of the line which passes through (−2, 0) and (0, 4)? −2 0 2 Undefined
faust18 [17]

slope is also m

m= Y2-Y1 / X2-X1

X1= -2

X2= 0

Y1= 0

Y2= 4

4-0/0-(-2)

4/2

divide by 2

4/2= 2

2/2= 1

2*1= 2

Answer: slope is 2

7 0
3 years ago
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Ms. Willer wanted to donate 27 cans of food to each of 8 food banks each of food to each of 8 food banks each of the 23 students
Natali [406]
It will need to be 9 as 27 by 8 is 216 and 23 by 9 is 207 and the you subtract 207 from 216 and get 9
7 0
3 years ago
D^2y/dx^2+4dy/dx-12y=cos2x
rjkz [21]
If you're solving for x, you'd move all the terms containing x to the left side of the equation:

d^2y/dx^2+4y/x-12y-cos^2(x)+sin^2(x)=0

If you're solving for y, you'd simplify both sides of the equation, then isolating the variable:

y=xcos(2x)
3 0
3 years ago
Solve the inequality |4x +4| < 12
mel-nik [20]

Start by dividing all terms by 4, to reduce this expression: |x+1| < 3.

Case 1: x+1 is already positive. The abs. val. operator does not change

anything. Then x+1<3, or x<2.

Case 2: (x+1) is negative. The abs. val. operator, in effect, puts a - sign in

front of (x+1): -(x+1)<3. Distributing the - sign: -x - 1 < 3. Adding 1 to both sides: -x < 4. We want to solve for positive x, so we mult. both sides of

-x<4 by -1 AND change the direction of the inequality symbol:

x > -4

Thus, the solution set is (-4,2): All real numbers between -4 and 2.


5 0
3 years ago
Read 2 more answers
Seven pens and two pencils costs $6.59. seven pens and five cost $7.55. Find the cost of one pencil and the cost of one pen.
serg [7]
Let one pen be x and one pencil as y, we can produce two equations in terms of x and y

7x+2y=6.59 ------> Equation 1
7x+5y=7.55 ------> Equation 2

We can use either Elimination or Substitution method. Let's try the substitution method

Rearranging equation one to get 7x=6.59-2y and substitute into equation 2, gives
(6.59-2y)+5y=7.55
6.59+3y=7.55
3y=7.55-6.59
3y=0.96
y=0.32

We can use either equation one or equation to work out x

7x+2(0.32)=6.59
7x=6.59-0.64
x=0.85

The price of one pen is $0.85
The price of one pencil is $0.32
5 0
3 years ago
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