)if a 50 kg student is standing on the edge of a cliff. find the student’s gravitational potential energy if the cliff is 40 m high

I believe it would be the below 

Ep=mgh (m=mass and h=height)
m=50kg g=9.81m/s^2 h=40
ep=50kg * 9.81 m/s^2 * 40m
ep=19,620 

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5

goog may have it for you