A ship is headed due north at a constant 24 miles per hour. Because of the ocean current, the true course of the ship is 15°. If the currents are a constant 22 miles per hour, in what direction are the currents running? (Enter your answers as a comma-separated list. Round your answers to the nearest whole number.)

Two ships left Port Hope on Lake Ontario at the same time. One travelled at 12 km/h on a course of 235 degrees. The other travelled at 15 km/h on a course of 105 degrees. How far apart were the ships after four hours to the nearest kilometre?

Two students are standing 15 feet apart. Between them is a wall. The angle of the student’s foot and the top of the wall is 20° and then 40° to the other student’s foot. How tall is the wall?  Round to the nearest hundredth.

Ann is a construction worker, and she is preparing to have concrete poured at her construction site. Each corner is designed to be a 90° corner. Using a tape measure, she takes measurements from the corners, marks a point, and then measures diagonally between the points to see if the corner is 90°. Which of the following sets of measurements would indicate that the corner she measured is 90°? Select all that apply. O 6 feet, 8 feet, and 10 feet O 6 feet, 8 feet, and 12 feet O 9 feet, 12 feet, and 14 feet O 9 feet, 12 feet, and 15 feet O 12 feet, 16 feet, and 18 feet O 12 feet, 16 feet, and 22 feet