ElectricPavlov

Then THAT should be in your question post !

Using the Quadratic Formula    with a = 7    b = 1     c = -5  

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

roots are   x=0.776739            x=−0.919596          

( .776739 -4)(-.919596 - 4 ) = .....................

100% -  (33.33% + 15 % ) = 51.667 % blue

Second batch is   1/(3+1) = 1/4th = 25% blue

.51667 (300)    +   .25(120)      =   x (420)         where x is the decimal percentage that is blue in the final concoction.

                                                                                   solve for 'x' 

Rectangle       6  x10  m²

   PLUS  triangle    1/2  * 6 *  7   m²

3 n  + n    -1 

4n - 1         ????

If   10 and 22 are factors , the LCM = 110    which has factors    1   2  5 10 11 22 55 110    

110

The angles are equal in a parallelogram

   8x -19 = 5x+38

3x = 57

x = 19

Not sure what is being asked .....

  maybe    (7n + n ) -1          _¹

                                8n    - 1          _²                               ????

Rectangular prism volume = 12 =  L W H

triangular prism volume =  1/3 base area * height

                                       = 1/3 (  1/2 L W ) H

                                        = 1/6 LWH      is removed      leaving     5/6 LWH       5/6 * 12 = 10 in³    remains

cos 32 = adjacent side / hypotenuse

Cos 32 =   18/x

x = 18 / (cos 32^o )          finish with a calculator