Physics
posted by Anonymous .
8) A man on the moon with a mass of 90 kilograms weighs 146 newtons. The radius of the moon is 1.74 x 106 meters, find the mass of the moon.
7.36 x 10^(28) kg
2.4 x 10^(10) kg
7.36 x 10^(22) kg
1.43 x 10^(4) kg
i'm unsure of how to do this as well.

146=GM*90/(1.74E6)^2
M= 146*(1.74E6)^2 /90G
and I get one of the answers.