A 3.3 kg mass weighs 30.03 N on the surface

Question

of a planet similar to Earth. The radius of
this planet is roughly 7.4 × 106 m.
Calculate the mass of of this planet. The
value of the universal gravitational constant
is 6.67259 × 10−11 N · m2/kg2.
Answer in units of kg

Answer 1

Solve this equation for M:

30.03 = G M*m/R^2
= G * M*3.3/(7.4*10^6)^2

where G is the universal graitational constant, 6.67^10^-11.

You should only keep two or three significant figures in the answer, since they have only given you a "rough" R value.