Gravitational pull on an object

[revo74]

How much does gravitational pull on an object decrease if the distance is increased 10 fold for example?

If planet x is stationary and part of a binary star system where star y is 1 AU away from it and star z is 1,000 AU's away, but also has 1,0000 times the mass, which star will exert more gravitational pull on planet x?

 

[jedishrfu]

use the gravitation formula and notice that its inversely proportional to the square of the distance. so 10 fold increase means 100 fold decrease