Plot the image of quadrilateral ABC D under a reflection across line L​

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

What is the difference between the equations of a vertical and a horizontal line?

If set d is not the empty set but is a subset of set e, then which of the following is true? d ∩ e = d d ∩ e = e d ∩ e = ∅