CPhill

What's the question   ???

 I think you're saying

C(20, n) + C(20,10)  = C(21, 11)    if so....subtract C(20,10) fom both sides

C(20,n)  = C(21, 11) - C(20, 10)

C(20, n)  = 167960

And  ... C(20, 9)  = 167960    and therefore..... C(20, 11)   equals the same

So...the sum of these "n's"  =  9 + 11   = 20

I think that's correct, Mellie

2(3/2)+-7   .....we don't have to do anything with it.....just distribute the "2" outside the parentheses across it....so we have....

2 * 3/2  - 7 =

3 - 7  =

-4

Definitely, not.......

(x-2)(3x+3)(x+2)  = 

3x³ + 3x² - 12x - 12

 [12 / 52 ] x [ 20 / 52 ] =

[4 / 13 ] x [ 5 / 13 ]  =

20 / 169  = 

about  11.8%

Thanks.....

Yep, MG1....that's it....!!!!

We have....using the Pythagorean Theorem...

√ [ 78 ^2  +  27^2  ]   =  

√6813 =

about 82.54 ft  = 83 ft to the nearest foot