Bob rode his scooter 2.3 miles to his friend's house, then 0.8 miles to the library, then 1.9 miles to the grocery store. If he rode the same route back home, how far did he travel in all

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?