How many neutrons does element x have if it’s atomic number is 34 and it’s mass number is 76

Atomic number is the number of protons in an element. Mass number is the sum of both protons and neutrons. Thus, if you subtract 34 from 76 you’ll get the number of neutrons in said element.

76 - 34 = 42 neutrons

The correct choice is c

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j