Abuoy floating in the sea is bobbing in simple harmonic motion with amplitude 13in and period 0.25 seconds. its displacement d from sea level at time t=0 seconds is 0in, and initially it moves downward. (note that downward is the negative direction.)give the equation modeling the displacement d as a function of time t.

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil