If a system of linear equations has infinitely many solutions, what does this mean about the two lines?

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

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 able to prepare using the sauce?