Here is my attempt:
F = Gm1m2 / d^2
F = (6.67*10^-11) * (1000) * (6*10^24) / (2300000 + 6400000)^2
F = 5287N
F = ma
a = F / m
a = 5287 / 1000
a = 5.2ms^-2
He did use the space bar . Did you mean Enter key ?
Maths - Cambridge/Fitzpatrick
Physics - Jacaranda/Surfing
Chemistry - Jacaranda/New Edition of Conquering Chemistry