answer to this one is b
Step-by-step explanation:

≈1.41
12 x 1.41=<span>16.92</span>
Step-by-step explanation:
E3, E6, E11, E7: no solution
E1, E12 : 1 solution
E2, E8, E10 : infinite solutions
Minus
The quadratic equation is
( -b+-SQRT(b^2 - 4ac) )/2a