Calculate the force of gravity between two objects of masses 1500 kg and 7500 kg, which are 0.25 m apart. please show me how to do this?

Use Newtons gravitation formula

F = GMm/r²

If we assume that the 0.25 m is the distance between the center of masses of the two objects

F = 6.674(10‾¹¹)(1500)(7500) / 0.25²

F = 0.012 N

I hope this helps.
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Newton's law of universal gravitation:
F = G(m₁m₂/r²)

Force of gravity, F = (6.674 × 10⁻¹¹) × [1500 × 7500 / 0.25²] = 0.012 N

Mutual force F = m1*m2*G/d^2 Newton
G being worth 6.67*10^-11 N*m^2/kg^2 and 1/0.25^2 = 4^2 = 16 ...therefore :
F = 1.5*7.5*16*10^6*6.67*10^-11 = 1.20*10^-2 N

Just plug in the numbers and do the calculation:
Force = G * mass1 * mass2 / (distance^2)
G = 6.67408 x 10^-11 m^3 kg^-1 s^2
mass1 = 1500 kg
mass2 = 7500 kg
distance = 0.25 m (center-to-center)