It's a quadratic equation. Solve it through factorisation.
5s^2 - 14s - 3 = 0
(5s + 1)(s - 3) = 0
5s + 1 = 0
or
s - 3 = 0
Therefore
s = -1/5
or
s = 3
Answer:
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16 halves......... add them all together and multiply by 2
5*4*3 = 60 ways
but, if flowers A,B,&C is the same as C,B,&A, then it’s
5*4*3/(3*2*1) = 10 ways