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First:  subtract the length of the towel bar from the width of the door:  70 1/3 - ( 24 1/4 )  =  46 1/12

Now to place this in the center of the door place half of this length on each side of the towel bar:

                      46 1/12  /  2  =  23 1/24

The bar should be placed  23 1/24 centimeters from each edge of the door.

A formula that can be used is:  AF·AF  =  AB·AC          or:          AF²  =  AB·AC

Because replacing 'x' witn '-x' in the equation (and simplifying) shows no change, it is an even function.

sqrt( (-x)² - 9 )  =  sqrt( x² - 9 )

For number 2:  Since the zeros occur at -2, 1, 3, and 4, the values are:  a = -2, b = 1, c = 3, and d = 4.

This will create the function:  y  =  A(x + 2)(x -1)(x - 3)(x - 4)

To find the value of A:  Since the value of y = 4 when x = 0, place these into the function:

      y  =  A(x + 2)(x -1)(x - 3)(x - 4)         --->         4  =  A(0 + 2)(0 -1)(0 - 3)(0 - 4) 

                                Simplifying              --->         4  =  A(2)(-1)(-3)(-4)

                                                                              4  =  A(-24)        

                             Dividing by -24          --->      -1/6  =  A

thats great I loved it

A for number two is -1/6

For number two, a=-2, b=1, c=3, d=4

The zeros for number three are 2 and -1

196² also means 196*196, which is equal to 38,416.

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Only once or atleast once 

V = l*w*h

A = 2*l*w*h*(1/l + 1/w + 1/h)

Suppose the dimension l is tripled, then the new prism has an amount of material

Al = 6*l*w*h*(1/3l + 1/w + 1/h) = 6*l*w*h*(1/l + 1/w + 1/h - 2/3l) = 3A - 4wh

Similarly for the dimensions w and h, Aw = 3A - 4lh and Ah = 3A - 4lw.

To have the least amount of material for the prism, choose Max(wh, lh, lw) = lw

which implies the dimension h is tripled with the prism having a volume of 7*9*12.

I guess you could do 7*6/6, just brainstorming here ok....