Arocket is launched into the air and follows the path, h (t) = -3 * t^2 + 12 * t t is time measured in seconds. determine how long it takes the rocket to hit the ground. show all work for full credit. my lesson didn't really explain this well for me. either that or i'm not getting it. could someone explain this a bit better? !

Apatient is to take 60 mg of an antibiotic on day 1, take 45mg on days 2 and 3, take 30mg on days 4 and 5 and take 15 mg on days 6 and 7. how many total mg will the patient take?

Can someone tell me if this is perpendicular? !

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.