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Look under your first post regarding question No. 1.

Note that CA = CB + AB = 8 + 5  = 13[Cphill made a small typo here. CA should be 13 not 12.
So....by similar triangles
ED /AD  =  FC /CA
16 / 20 = FC / 13         
4 /5 = FC /13   multiply both sides by 13
13 * 4 /5  =  FC  =    52 / 5  =   10.4

Do you have a specific problem???

I'm not sure what is wanted on these two questions, GM

1/x + 1/y = 1/6

[ x + y ] / xy =  1 / 6

xy / [ x + y ]  = 6

xy =  6 [ x + y]

xy = 6x + 6y

xy - 6y  = 6x

y ( x - 6) = 6x

y =  6x / (x - 6)

When  x = 7    y = 42

When x = 8 , y = 24

When x = 9, y = 18

Whex = 10, y = 15

When x = 12, y = 12

So....these are the solutions...........note..... x and y are abrbitrary......so these answers can be "reversed" for x and y

I dont think that is the right answer

Really need to see a diagram here, Bleh........we don't know the orientation of the given points

Not sure about this...but....

Put one coin in any unit square

Then the second coin can be placed in any of the other 15 unit squares

But.....only 6 of them are either in the same row / column

So.....9 aren't

So......the probability that the two coins do not lie in the sane row/column = 9 /15  =   3 / 5

Easy....

In the form   ax2 + bx + c = 0

The discriminant  is

b^2 - 4ac

So....for 

x^2 + 2x + 3 = 0                a = 1       b = 2     and c = 3

So.....the discriminant is

(2)^2 - 4(1)(3) =

4 - 12 =

-8

Based on this.....Can you figure out the other two GM ????

Thanks to both of you! I hope I will like this website, too!

This Is What It Shows

https://web2.0calc.com/img/upload/?err=invalidcaptcha 

Well....it  first traveled 1000 km west

And from this point it traveled another 500 km west

So....the total displacement =  1000 + 500  =  1500 km

Oh if an aircraft travels 1000 west and then 500 west, they are adding the distance.

Ok Thanks

Sorry for asking, but how does that make sense?

1500  km

98.     18/59   ≈  30.5%

99.      34/41 ≈   82.9%

100.    48 /100  =  48%

Ok I took the picture so what is next?

See my answer under the original post.....

Thanks