Answer:
10.50x = 63
You'll divide 63 by 10.50 to get 6 weeks.
Step-by-step explanation:
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x=-3,x=9
x^2-6x-20-7=0
x^2-6x-27=0
x^2-(9-3)x-27=0
x^2-9x+3x-27=0
x(x-9)+3(x-9)=0
(x+3)(x-9)=0
12
(5+7)/7=12/7.
Green box = 12.
C