Step-by-step explanation:
Add the diameters of Earth and Mars together and then compare the result to that of Jupiter:
[tex]D_E + D_M = 1.28×10^4 + 6.785×10^3 = 1.96×10^4\:\text{km}[/tex]
Jupiter's diameter of [tex]1.428×10^5\:\text{km}[/tex] is much larger than the combined diameters of the Earth and Mars by more than a factor of 7.
