Uranus (mass = 8.68 x 1025 kg) and
its moon miranda
(mass = 6.59 x 1019 kg) exert a
gravitational force of 2.28 x 1019 n on
each other. how far apart are they?

129,398,203.7 m

Explanation:

According to Newton's law of Universal Gravitation, the force exerted between two bodies of masses and and separated by a distance is equal to the product of their masses and inversely proportional to the square of the distance:  

(1)

Where:

is the gravitational force

is the gravitational constant

is the mass of Uranus

is the mass of Uranu's moon, Mirana

is the distance between Uranus and its moon

Isolating :

(2)

(3)

Finally:

no simpler subs form complex ones. synthesise = make