This is math, not English, but okay xD
"Two intersecting lines are perpendicular if and only if they form four 90 degree angles" would be my answer.
The answer is:
B. The conflict has been resolved and order restored — at the expense of the Pequod, its crew, and its captain.
In literature, the falling action comes after the climax, when the main conflict has been reached and finds a resolution. In "Moby D*ck," by Herman Melville, the falling action occurs after Captain Ahab and his crew are killed by the whale.
The third option is correct: "Art and math are courses architecture students must have on their schedules."
The other two uses the word "their" when referring to a single thing/person. The correct word should be: "Each architecture student must plan his/her high school and college courses carefully." and "Every school of architecture sets its own specific requirements."
