Given:   f(x)    and  g(x)  
the composite function    is  x² + 2x - 2x² + 2xx² - 2.

false

explanation:

boats, things on boats luggage are way more heavy then water.

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

i think they are all correct

explanation:

they seem good

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.