Answer:
B. -20
Step-by-step explanation:
8/d = -12/30
We can use cross products to solve
8 * 30 = d* -12
240 = -12 d
Divide each side by -12
240/-12 = -12d/-12
-20 = d
<span>x(7y) this is what it would be</span>
Due to the margin of error of 10% I would say that then at least 48% wanted the school year lengthened and at least 32% want to keep it the same. I got these figures by subtracting the 10% from the nominal figures to give minimum figures for both.