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I just don't get what the link 

See https://web2.0calc.com/questions/i-still-need-help_1#r3

does, thats all

well it could be [biggest number],-[biggest number],1

since we have that 2*10^6=2000000 and 5^12=244140625 and 2^12=4096 so the equation becomes 244140625-2000000+4096=(244140625-2000000)+4096=242140625+4096=242144721 where we know 19 is one of the factors since we have 3 x 3 x 3 x 3 x 7 x 7 x 13 x 13 x 19 x 19 = 242,144,721. It can also be written in exponential form as 3^4*7^2*13^2*19^2.

I think it's 19

so we have the equation $4000/$25 since the person get $25 per day or 25/dpd and we need $4000 so the equation $4000/$25=160days and it will take 160 days or 3840 hours.

we know that 0.5=1/2 and this is 0.0101010... more than 1/2 and we know that 100/199=0.502512563...,101/199=0.507537688,102/199=0.512562814... so 0.5101010... is in between 101/199 and 102/199 so we have that 0.5101010... is 101/198

Who's a noob?

1)   Find the perimeter         P = a + b + c

2)   Find semiperimeter       s = ( a + b + c ) / 2

3)   Find area                       A = sqrt [ s( s-a )( s-b )( s-c )]       ( Heron's formula )

4)   Calculate inradius          r = A / s

5)    Calculate circumradius     R = ( abc ) /4rs

6)    Inner angles                    a² = b² + c² - 2bc * cos(A)         ( The law of cosines ) 

I hope it covers everything you wanted to know. 

that was wrong as well but it's ok it is really hard problem

What do mean "that doesn't help"? You got 2 correct answers there! if you don't undestand them, that is YOUR problem !!!.

umm...that doesn't really help

oops!it is -4!

1/2800 = 0.0003 571428 571

1 - The non-repeating part is 4 digits (0.0003)

2 - The repeating part is 6 digits (571,428) 

that was wrong

please double-check your answer (i can't risk getting this problem wrong )

Well, since Mark is already on the committee, which leaves 9 people to choose the remaining two. In how many ways can you choose 2 people out of 9?  You can choose 2 people out of 9 in: 9 C 2 =36 ways.

That is my best attempt! What have YOU done to get the "right answer"? Can you show us your attempt?

say x=1 and y and z=0 so 1*0*0=0 so answer is 0!

AC²  =  AB² + BC²     --->     AC²  =  12² + 5²     --->   AC  =  13

AD / AB  =  AB / AC     --->     AD / 12  =  12 / 13     --->     AD  =  144/13

DC  =  AC - AD     --->   DC  =  13 - 144/13     --->     DC  =  25/13

AD / DB  =  DB / DC     --->   DB²  =  AD · DC     --->     DB²  =  (144/13) · (25/13)

                  --->     DB  =  60/13

DB is the geometric mean of AD and DC.

Let  PA = x.

PA · PB  =  PC · PD     --->     x(x+ 35)  =  (30)(30 + 20)

                                               x² + 35x  =  1500

                                    x² + 35x - 1500  =  0

                                     (x + 60)(x - 25)  =  0

                                                           x  =  25

Maybe reload.

whaat?