ElectricPavlov

You are CORRECT !   My mistake......I corrected my answer above....  Thanx!    ~ EP    

"her on the th day of her life"......     On WHAT day?????  .

two numbers   x  and y

harmonic mean:                ( 2/(1/x+1/y) )=75   re-arranging

                                              2 (x * y)/(x+y) = 75

arithmetic mean :

(x+y)/2 = 2700   re-arranging

    y = 5400- x       sub this into red equation

2x(5400-x)/5400 = 75   re - arrange to

   2 x^2 -10800x + 405000 = 0    Quadratic Formula shows x =  5362.24     and y = 37.76

Geometric mean:    sqrt (x*y) =~   450

(Thanx Guest for noticing my error....I have corrected this post)

Is reaching to top considerd to be when the frog falls back 4 meters and his height is 20 m from the bottom?

  if so, then each day he gains 1 meter in height    .....   it will take 20 days.  Not that for several days the frog's 5 meter jump will raise it higher than the lip of the well....but the frog falls back down.....

arctan(1) + arctan(2) + arctan(3) = 3.141592653589      from the Web2.0 calculator ...as guest found.

This is just tedious

f(1) = -1

f(-1) = 7

f(7) = -49

f(-49) = -41

f(-41) = -34

23:59:59    12/31/19    ....and then it's

2020 !   Happy New Year !!

     I do not see any zeros at the end of 2019!           

(but ...there is ONE at the end of 2020   !  )

3+4+5 =12    180/12=15  so the angles are

3(15)    4(15)   5(15)

45         60        75

SMALLEST ANGLE   45    SIN = SQRT2 / 2        NEXT LARGER ANGLE  SIN60 = SQRT3/2

RATIO =  SQRT2 /2   :  SQRT 3/2

           = SQRT 2  : SQRT 3  

cos 30 = sqrt3/2   = adj/hyp = diameter/hyp

                sqrt 3  /2   =   dia/(1/pi)  =   dia (pi)

               (sqrt 3 /2)/pi = dia

circumference = pi x dia   =    sqrt3 /2  = ~ .866

Check the -b part of the Quad Form in your answer.......AND the -4ac part too