ElectricPavlov

= 50 x  - (-2)  = 50x +2        which also equals   2(25x+1)

Definition:   i = sqrt(-1)     so  i^3 =  i^2 x i  =  -1 x i =  -i

1/1000 =  .001 =  10^-3     LOG (10^-3) =  - 3

Let's find Alex' head start:     7 min = 7/60 hr

7/60 x 3 = 21/60 mile head start.

Now Alex distance will equal Ben's distance when they meet.

Rate x time = distance

Alex' distance = 21/60 + 3 t  =  3.5 t    Solve for   t = 42/60 = 42 minutes

In 42 minutes, Ben will have walked   42/60 x 3.5 = 2.45 miles  

50 - 38% (50) =  50 - .38 (50) = 31

50 (1.125) = $ 56.25

First find the area of the SECTOR of the circle.....

  Then SUBTRACT the area of the TRIANGLE....

r= 11km     Area of CIRCLE = pi x r^2 = 3.14 x 11^2 = 380.132 sq km

Area of SECTOR =   60/360  x  380.132 = 63.355 sq km

Area of triangle = (equalateral triangle) = A = (sqrt3)/4  x 11^2 = 52.395 sq km

Area Sector - Area Triangle = area segemnt =      63.355 - 52.395 = 10.96 sq km

EVENTUALLY, you may be able to realize that the answer would just be   225 x (.997/.917) = 244.629 ml

without having to go through all fo the other calcs !

The numbers available are 100 - 999      We can throw out 100 (multiple of ten)  which leaves 899 numbers available

there are 10 per each 100  (101- 901) that are multiples of TEN   except for 901-999 there are only 9 that are multiples of ten

899 - (8 x 10) - 1(9) = 810 numbers available