The second boulder would have a greater mass because there are 1000 grams in a kilogram so 4,800,000 divided by 1,000 = 4,800kg which is greater than 4,600kg -have a nice day! :)
2x+20=58 then your would subtract 20 from 58 which would turn into 38 and your would divide 38/2 it would be 19 so the answer is x=19 if I’m not mistaken this is correct hope this helps
