Uh i kinda need this answered now

which of the following may you do to a vector without changing it?

rotate the vector through any angle other than 360°.
move the vector without changing its orientation.
multiply the vector by a scalar other than 1.
add a nonzero vector to the vector.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

What occurs during a combustion reaction

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value