Lm so confused, someone solve and explain

How do i put 3(x+7) in distributive property

Madeline takes her family on a boat ride. going through york canal, she drives 6 miles in 10 minutes. later on as she crosses stover lake, she drives 30 minutes at the same average speed. which statement about the distances is true?

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i