Answer:
F= G m₁m₂/r²
a. F is directly proportional to the masses so any increase in the masses will increase the Force F and vice versa.
b. F is inversely proportional to the square of the distance between the masses so any increase in the distance will decrease the force F and vice versa.
c. G is a gravitational constant and is expressed in Nm²/kg². this will give force in Newtons