ElectricPavlov

4x-15 = 6x+31    when they are equal, it is a point of intersection of these two lines ....subtract 4x from both sides to get

-15 = 2x + 31      now subtract 31 from both sides to get

-46 = 2x              now divide both sides by two

x = - 23                      this ould be the x value where   f(x) = g(x)

111 numbers ARE divisible by 9 out of the thousand  ( 9   18  27 ....... 990  999)

means     1000-111 = 889 numbers ARE NOT  divisible by '9'

6t > t + 6 + 2t.

6t > 3t + 6

3t > 6

t>2

Here is a picture to get you started.....what do YOU think the answer to be?

3/4 = 9/12         is the whole job  

    he has   done   1/3 + 1/4 = 7/12

7/12 / 9/12 = 7/9 ths done

For angle W    TAN W = opposite side / adjacent side =  XY / 1

so    tan 70 = XY/ 1

     (1) * tan 70 = xy        <  ====== finish from here

.75³  = 3/4³  =  27/64 = 0.421875

I would suggest graphing the lines as below.

Then find the are below line L      1/2 b * h        ( 18 units² )

   Find the area below line M        1/2 b * h         (9 units² )

        so the area between them is 1/2 of the area below line L       Probability is thus 1/2  = .50

1  1/4 - 5/6 =   15/12 - 10/12 = 5/12 mile between the houses

Initially

a = 1380 + b     

then

(a-640)  = 5 (b - 640)     sub in the red equation

(1380+b) - 640   = 5b - 3200

b = 985