ElectricPavlov

-10m + 8 <= 10m - 2       Add '10m' to both sides of the equation:

8 <= 20m-2                     add '2' to both sides

10 ≤ 20m           divide both sides by 20

1/2≤m              you can switch it around to

m ≥ 1/2

EXTREMELY similar :      (see if you can do this one)

https://web2.0calc.com/questions/right-triangle_17#r1

median side   of  2 6 7  is the 6 side

6 out of (2+6+7) = 6/15          6/15 * 345 = 138 yards

2432 ounces / 128 ounces / gal =   2432/128  gal = 19 gal

The yellow is 1/4 of the whole circle area

cicle area = pi r^2  

   1/4 pi 5²  mi²  =   area of yellow

This is a right triangle (check it with pythag theorem)

sin A = opp side / hypot

          = 9/11

Square base     17 x 17 mm²

plus FOUR triangles     4   * 1/2 17*20     mm²

three squares  6x 6         3*6*6     m²

PLUS  two triangles     2 * 1/2 ( 6)(4)     m²        add the reds

18 is to 12     as 12 is to a+5

18/12 = 12 / (a+5)

a+5  = 12 *  12/18 = 8

a = 3