Which formula can be used to find the x-component of the resultant vector?
a. tx - ux - vx
b. tx + ux + vx
c. tx = tcosθ
d. tx = tsinθ

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up