Two gravitational forces act on a given object. How do you determine the total gravita-
tional force acting on the object?

Explanation:

Depends on the location of the two forces.  If they are aligned on the same side of the object, you would simply add.

X F1 F2

X is the object. F1 and F2 are both masses which create a gravitational force. They both are the form of Fx = G * m1 * m2 / r^2. The total force is F1 + F2

If they are are on either side of the object, you subtract.

F1 X F2

Fx = F1 - F2

Any other location of F1 and F2 is much more complicated by the use of trigonometry.