1. N

    Brain fart on square roots

    √9 = 3 but is it also - 3? how do i know when a square root is + or -?
  2. T

    Brain Fart :/

    a stone is tossed doown with a speed of 8 m/ s from the edge of a cliff 63 m high. how long will it take to hit the foot of the cliff? a= -9.8 m/s ^2 vi= -8 m/s s= 63m 63m= - 8 m/s(t) + 1/2(9.8m/s^2)(t)^2 does this look right ? and if so how do i solve for t? Just confused can...