Which of the following quantities is a vector? A. 400 gallons per minute
B. 312 days
C. 1056 grams
D. 3 feet per second north

Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

With i really need the correct answer!