Draw a quadrilateral with 2 pairs of perpendicular lines

What is the missing step in this proof ?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Beth divided 9 ounces of her granola recipe into 4 equal-sized amounts. she placed the amounts into individual bowls. the fraction 9/4 represents the number of ounces of granola in each bowl. which other number represents the amount of granola beth has in each bowl? (a) 1 1/4 (b) 2 1/4 (c) 1 3/4 (d) 3 3/4 i need !