Hi,



Excel CORREL function

r = -.9866    



Regression line equation:    

www.alcula.com/calculators/statistics/linear-regression/

 y = -7.7143x + 96.286

grade mising 3.5 days = 69

 

Hi,



X	 #	P(X = x)

1	4	0.028571429

2	4	0.028571429

3	3	0.021428571

4	6	0.042857143

5	17	0.121428571

6	20	0.142857143

7	22	0.157142857

8	24	0.171428571

9	11	0.078571429

10	29	0.207142857

 

Hi,

 

Hi,

Miguel passed seven of his history-class quizzes and 

      failed three. 

The fraction of quizzes he passed is correctly expressed as: 7/10

 

Hi,

Using the standard slope-intercept form for an equation of a line y = mx + b

  where m is the slope and b the y-intercept.

 m = -2 and b = -1 

Line

 y = (-2)x + (-1)

 y = -2x  - 1        or  2x + y = -1   or  2x + y + 1 = 0

 

Hi,

Using the standard slope-intercept form for an equation of a line y = mx + b

  where m is the slope and b the y-intercept.

line that passes through the point 

(2,1) and 

(2,5)    m = -4/0 , NO slope, vertical line x = 2

 

Hi,

Using the standard slope-intercept form for an equation of a line y = mx + b

  where m is the slope and b the y-intercept.

line that passes through the point (2,4) and has the indicated slope m =  -1.   



Line

 y = (-1)x + b

 4 = (-1)·2 + b   |Using ordered pair (x,y):(2,4)  to solve for b

 6 = b

 y = -x + 6        or x + y = 6

 

Hi,





 r^2 = 36,  r = 6

 

Hi,

 = 

 

Hi,

Let u = (x^3-2x), du = (3x^2 - 2)dx

 = (1/6)(x^3-2x)^6 + C

 

Hi,

Let u = (x+7), du = dx

 = ln |x+7| + C

 

Hi,

 

Hi,

(9,4)

(5,1)    D = 

 

Hi,

 x^2 + 5x - 6 = 0

 (x + 6)(x -1) = 0   x = -6   or  x = 1

Use FOIL to check the factoring

F	First terms x^2

O	Outside terms  -x

I	Inside terms  +6x

L	Last terms  -6

 

 

Hi,

27z+23z^2+6z^3/2z+3 = 3z^2 +7z + 3  R = -9

Found by doing routine long division

           3z^2 +  7z +   3

2z +3|6z^3 + 23z^2 + 27z

         

 

Hi,

y=(x^3 -3x^2)/(2x-1) = .5x^2 - 1.25x - .625   R = -.625

Found by doing routine long division

2x -1|x^3 - 3x^2

 

Hi,



     -2 = v/9

    -18 = v

 

Hi,Previously Posted

The area of a square field is 100 sq m. less than the area of a rectangular field of dimensions 48 m and 12 m.

   , s = 21.81m, P = 87.27m^2

 

Hi,

if E(x)=11/3 find the values of a and b

Two unknowns, needs 2 EQs... to find a and b

I.   or 

II. comes from the E(x) =  or 

 a +  b = 2/5

2a + 4b = 4/3     |Verify the 2 Eqs and Solve for a and b 

 

Hi,

couple of Examples:

the idea is A(only) + B(only) + A&B + neiher A or B = Total Sample

In this example:  5 + 9 + 3 + 7  would tell us we started witha sample of 24



Three Venn 

 

Hi,

Let and represent the larger and smaller number respectively

 x+ y = 32

 x- y = 12    |Adding the EQs to eliminate y

 2x = 44

  x = 22  and 

  y = 10 , the smaller number    

 

Hi,

The area of a square field is 100 sq m. less than the area of a rectangular field of dimensions 48 m and 12 m.

   , s = 21.81m, P = 87.27m^2

 

Hi,

7 years ago, Timothy was 4 years old.  NOW 

Jasmine is now 3 years older than timothy.  Jasmine NOW 

 How old will jasmine be 9 years from now. 

 

Hi,



find the slant height of a square pyramid with a base of 8cm if its lateral area is 128cm^2 

To find s, the idea is to first determine the area of each triangular side

and apply:    0r  s = 2A/b

 

Hi,

For ex: 50% of something is 1/2 of it...  50/100 = 1/2 = .50

If we were finding 50% of 58 that would be  ...or half of it



Likewise 9.2% of 58 = 

 

Hi,

Note: 



 -1/.216 = -4.629  

 

Hi,

 The volume of a cubical water tank is 729 cubic metres

  h = 9m  and Area of its bottome surface is 

 

Hi,

3 orders for french fries for every 10 people 

42 people did not order french fries

how many people  ordered lunch at hal's today

Question Sets up a Proportion:

    || Cross Multiply to solve for x

 

Hi,

   | Cross Multiplying to solve

      2x =  3x-2       | solve for x

 

Hi,

 =.833   =  percent