<span>Yes it is true that a continuous function that is never zero on an interval never changes sign on that interval. This is because of ever important Intermediate Value Theorem.</span>
You can use a diffrent kind of ruler for math then you could find the answer.
Answer:
is it 4.8, I don't really know
One reason that negative numbers would not make sense for values of the variables is that the solution having a negative value is not valid. It might be that the expression represents a real word problem and a negative value will not make any sense. Hope this helps.
THE ANSWER WILL BE 3 BECAUSE I HAD DID MY MATH