How far away is venus from the sun in kilometers (km) a) 108km b) 106km c) 123km d) 107km i'm stuck between 108km and 107km

Find the difference (8ab+a+2) - (3ab+6)

How to do this , and can some one explain

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours