How can we predict the sign of the product or quotient of sign numbers?

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be bale to prepare using the sauce?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Is a square always, sometimes, or never a parallelogram